350 MONTANA V. DEBRA HAALAND

FILED
FOR PUBLICATION
OCT 14 2022
UNITED STATES COURT OF APPEALS MOLLY C. DWYER, CLERK
U.S. COURT OF APPEALS

FOR THE NINTH CIRCUIT

350 MONTANA; MONTANA No. 20-35411
ENVIRONMENTAL INFORMATION
CENTER; SIERRA CLUB; WILDEARTH D.C. No. 9:19-cv-00012-DWM
GUARDIANS,
ORDER AND
Plaintiffs-Appellants, AMENDED OPINION

v.

DEB HAALAND, Secretary of the
Department of the Interior; U.S. OFFICE
OF SURFACE MINING, an agency within
the U.S. Department of the Interior; U.S.
DEPARTMENT OF THE INTERIOR;
MARCELO CALLE, in his official
capacity as Program Support Division
Manager of U.S. Office of Surface Mining
Western Region; DAVID BERRY, in his
official capacity as Regional Director of
U.S. Office of Surface Mining Western
Region; GLENDA OWENS, in her official
capacity as Deputy Director of U.S. Office
of Surface Mining; LAURA DANIEL-
DAVIS, in her official capacity as
Principal Deputy Assistant Secretary of
Land and Minerals Management of the
U.S. Department of the Interior;
MARTHA WILLIAMS, in her official
capacity as Director of U.S. Fish and
Wildlife Service; UNITED STATES FISH
AND WILDLIFE SERVICE, an agency
within the U.S. Department of the Interior,
 Defendants-Appellees,

SIGNAL PEAK ENERGY, LLC,

Intervenor-Defendant-
Appellee.

Appeal from the United States District Court
for the District of Montana
Donald W. Molloy, District Judge, Presiding

Argued and Submitted June 16, 2021
Anchorage, Alaska

Before: Johnnie B. Rawlinson, Morgan Christen, and Ryan D. Nelson, Circuit
Judges.

Order;
Opinion by Judge Christen;
Dissent by Judge R. Nelson

2
 SUMMARY *

Mining / Environmental Law

The panel filed (1) an order amending the opinion filed on April 4, 2022,
denying the petition for panel rehearing, and denying, on behalf of the court, the
petition for rehearing en banc; and (2) an amended opinion affirming in part and
reversing in part the district court’s summary judgment in favor of the U.S.
Department of the Interior (“Interior”) on all but one claim in an action brought by
environmental groups challenging Interior’s Office of Surface Mining Reclamation
and Enforcement’s approval of a proposal to expand a coal mine in south-central
Montana.

Signal Peak Energy, LLC, an intervenor-appellee, sought to expand its
mining operations. The expansion is expected to result in the emission of 190
million tons of greenhouse gases (GHGs). Interior published an Environmental
Assessment (EA) in which it explained that the amount of GHGs emitted over the
11.5 years the Mine is expected to operate would amount to 0.44 percent of the
total GHGs emitted globally each year. Based on a 2018 EA, Interior found that
the project’s GHG emissions would have no significant impact on the
environment.

The district court granted summary judgment in favor of Interior on all but
plaintiffs’ claim that Interior failed to consider the risk of coal train
derailments. The district court vacated the 2018 EA, but not Interior’s approval of
the Mine Expansion, and remanded the matter to Interior to consider the risk of
train derailment. Interior subsequently published a fourth EA that incorporated the
2018 EA and considered train derailment risks for the first time.

As a threshold issue, Signal Peak argued that the case was moot because
plaintiffs challenged the 2018 EA, but the 2018 EA was superseded by the EA
Interior published in 2020 after the district court remanded the case to the agency
to consider the risk of train derailments. The panel held that the parties’ dispute
was not moot. The 2018 EA pertaining to the Mine Expansion neither disappeared

*
This summary constitutes no part of the opinion of the court. It has been
prepared by court staff for the convenience of the reader.
nor was it replaced. The relevant portions of it were expressly incorporated into the
2020 EA and reissued. Accordingly, the panel retained the ability to order relief in
this case.

The panel held that Interior violated the National Environmental Policy Act
(NEPA) by failing to provide a convincing statement of reasons why the project’s
impacts were insignificant. The 2018 EA failed to articulate any science-based
criteria of significance in support of its finding of no significant impact (FONSI),
but instead relied on the arbitrary and conclusory determination that the Mine
Expansion project’s emissions would be relatively minor. The panel, however, was
not persuaded that Interior was required to use the Social Cost of Carbon metric (a
method of quantifying the impacts of GHGs that estimates the harm, in dollars,
caused by each incremental ton of carbon dioxide emitted into the atmosphere in a
given year) to quantify the environmental harms stemming from the project’s GHG
emissions. The panel further held that it was less clear whether the agency had any
other metric available to assess the impact of this project. Because the record
concerning the consequences of vacatur was not developed, the panel remanded to
the district court. Additional factfinding is necessary to determine whether vacatur
of the plan approval is warranted at this juncture.

Judge R. Nelson dissented. He would hold that the agency’s finding - that
the incremental effects of 0.04% of annual GHG emissions were “minor” - was not
arbitrary or capricious under the Administrative Procedure Act (APA); and the
majority’s contrary holding was wrong given the deferential APA review. Judge
Nelson agreed with the majority’s decision not to vacate Interior’s approval of the
Mine Expansion or direct Interior to prepare an EIS. He would hold that Interior’s
FONSI was neither arbitrary nor capricious under NEPA. Even if it were, the
action should be remanded to the agency to compile a new administrative record
and final decision, not to the district court.
 COUNSEL

Shiloh S. Hernandez (argued) and Melissa A. Hornbein, Western Environmental
Law Center, Helena, Montana; Nathaniel Shoaff, Sierra Club, Oakland, California;
for Plaintiffs-Appellants.
Brian C. Toth (argued), Michelle-Ann Williams, and Robert J. Lundman, Attorneys;
Eric Grant, Deputy Assistant Attorney General; Jonathan D. Brightbill, Principal
Deputy Assistant Attorney General; Environment and Natural Resources Division,
United States Department of Justice, Washington, D.C.; Kristen C. Guerriero and
Emily D. Morris, Attorneys; Office of the Solicitor, United States Department of the
Interior, Washington, D.C.; for Defendants-Appellees.

John C. Martin (argued) and Bryson C. Smith, Holland & Holland LLP, Washington,
D.C.; Hadassah M. Reimer, Holland & Hart LLP, Jackson, Wyoming; Sarah C.
Bordelon, Holland & Hart LLP, Reno, Nevada; Victoria A. Marquis, Crowley Fleck
PLLP, Billings, Montana; Derek Shaffer, Quinn Emanuel Urquhart & Sullivan LLP,
Washington, D.C.; Sage V. Heuvel and Kathleen M. Sullivan, Quinn Emanuel
Urquhart & Sullivan LLP, Los Angeles, California; for Intervenor-Defendant-
Appellee.

Mark N. Templeton and Robert A. Weinstock; Andrew Burchett, Justin Taleisnik,
and Daniel Abrams, Certified Law Students; Abrams Environmental Law Clinic,
Chicago, Illinois; for Amicus Curiae Professor Michael Greenstone.

Richard L. Revesz, Max Sarinsky, and Jason A. Schwartz, Institute for Policy
Integrity, New York, New York, for Amicus Curiae Institute for Policy Integrity at
New York University School of Law.

Brent Mead, Assistant Solicitor General; David M. S. Dewhirst, Solicitor General;
Austin Knudsen, Attorney General of Montana; Office of the Attorney General,
Helena, Montana; for Amici Curiae State of Montana and 15 Other States.
 ORDER

The opinion filed on April 4, 2022, is amended as follows: On slip opinion

page 8, lines 19–20, delete .

On page 36, line 22, replace the final period of the paragraph with <; see

also Ctr. for Biological Diversity, 538 F.3d at 1225 (If the evidence in the record

demonstrates that a project may have a significant impact, it is appropriate to

remand with instructions to prepare an EIS). On remand, the district court may

reconsider, based on the existing record, whether to order an EIS, or remand to the

agency to determine whether to prepare a new EA or an EIS.>

On page 36, line 23, replace the word with .

On page 37, lines 16–17, replace <. Further,> with <, and>.

On page 37, lines 22–23, delete .

On page 37, line 27, delete footnote 28.

The following changes are made to the dissent:

On page 49, line 17, insert between and .

On page 57, line 6, capitalize .

On page 60, line 11, replace <2020> with <2021>.
 With these amendments, Judges Rawlinson and Christen vote to deny the

petitions for panel rehearing and rehearing en banc filed on June 21, 2022, and

Judge Nelson votes to grant the petitions. The Petitions for Rehearing and

Rehearing En Banc are DENIED. No further petitions for rehearing will be

accepted.
 OPINION

CHRISTEN, Circuit Judge:

In 2018, the Department of the Interior’s Office of Surface Mining

Reclamation and Enforcement (Interior) approved a proposal to expand a coal

mine in south-central Montana. The expansion is expected to result in the emission

of 190 million tons of greenhouse gases (GHGs). Interior published an

Environmental Assessment (EA) in which it explained that the amount of GHGs

emitted over the 11.5 years the Mine is expected to operate would amount to 0.44

percent of the total GHGs emitted globally each year.1 The 2018 EA also

calculated the project’s GHG emissions as a percentage of the United States’

annual emissions and Montana’s annual emissions, but these domestic calculations

only included the emissions generated by extracting and transporting the coal.

Emissions from combustion of the coal—which account for 97 percent of the

projected GHG emissions from the project—were not included in the domestic

calculations. Based on the above comparisons, Interior found that the project’s

1
The 11.5 years includes two years during which the Mine would be
operating regardless of the approval at issue in this case. Interior’s approval of the
project will allow the Mine to operate an additional nine years. During that time,
approximately 190 million tons of GHGs are expected to be emitted. Over the
entire 11.5 years, 240.1 million tons of GHGs are expected to be emitted.
3
GHG emissions would have no significant impact on the environment. Interior did

not prepare an environmental impact statement (EIS).

We conclude that Interior violated the National Environmental Policy Act

(NEPA), 42 U.S.C. § 4321 et seq., by failing to provide a “convincing statement of

reasons to explain why [the] project’s impacts are insignificant.” Bark v. United

States Forest Serv., 958 F.3d 865, 869 (9th Cir. 2020). The 2018 EA fails to

articulate any science-based criteria for significance in support of its finding of no

significant impact (FONSI), relying instead on the arbitrary and conclusory

determination that the Mine Expansion project’s emissions will be relatively

“minor.” But comparing the emissions from this point source against total global

emissions predestined that the emissions would appear relatively minor, even

though, for each year of its operation, the coal from this project is expected to

generate more GHG emissions than the single largest source of GHG emissions in

the United States. Separately, the EA’s domestic comparisons fail to satisfy NEPA

because Interior did not account for the emissions generated by coal combustion,

obscuring and grossly understating the magnitude of the Mine Expansion’s

emissions relative to other domestic sources of GHGs. See League of Wilderness

Defs./Blue Mountains Biodiversity Project v. Connaughton, 752 F.3d 755, 761 (9th

Cir. 2014). Though we conclude that Interior failed to articulate convincing

4
reasons to support its FONSI, we are not persuaded that Interior was required to

use the Social Cost of Carbon metric to quantify the environmental harms

stemming from the project’s GHG emissions. What is less clear is whether the

agency had any other metric available to assess the impact of this project.

The presumptive remedy for violations of NEPA and the Administrative

Procedure Act is vacatur. 5 U.S.C. § 706 (“The reviewing court shall . . . hold

unlawful and set aside agency action, findings, and conclusions found to

be . . . arbitrary, capricious, an abuse of discretion, or otherwise not in accordance

with law.”); All. for the Wild Rockies v. U.S. Forest Serv., 907 F.3d 1105, 1121–22

(9th Cir. 2018). Here, because the record concerning the consequences of vacatur

is not developed, we remand to the district court.

I

i

Intervenor-Appellee Signal Peak Energy, LLC operates Bull Mountains

Mine No. 1 (the Mine), which is located approximately thirty miles north of

Billings, Montana. In 2008, Signal Peak applied to the Bureau of Land

Management (BLM) to lease approximately 2,679.76 acres of federal coal. See

Mont. Env’t. Info. Ctr. v. U.S. Off. of Surface Mining, 274 F. Supp. 3d 1074, 1083

(D. Mont. 2017). BLM processed Signal Peak’s application, prepared an

5
Environmental Assessment in conjunction with Interior, and issued a FONSI in

2011.2

In 2012, Signal Peak applied to the Montana Department of Environmental

Quality (Montana DEQ) to amend its mining permit. Specifically, Signal Peak

sought to expand its mining operation by 7,161 acres, “adding 176 million tons of

coal to its permitted mineable reserves.” Mont. Env’t Info. Ctr., 274 F. Supp. 3d at

1084. The Montana DEQ approved Signal Peak’s application. Id.

In 2013, Signal Peak requested approval of a mining plan modification for

its federal coal lease from OSMRE. Id. The 2013 modification request sought to

expand coal development and mining operations into 2,539.76 acres of the

remaining federal coal lands. Id. Signal Peak describes the area as “a

‘checkerboard’ of federal minerals interspersed with privately-owned and state-

2
BLM and the Office of Surface Mining Reclamation and Enforcement
(OSMRE) are agencies within the Department of Interior. BLM oversees the
leasing of federal coal, 43 C.F.R. § 3480.0-6(a)(3) and OSMRE oversees surface
coal mining operations, 43 C.F.R. § 3480.0-6(a)(1). Because Signal Peak applied
to lease and mine federal coal in 2008, BLM and OSMRE cooperatively prepared
an EA in 2011. Signal Peak’s subsequent requests did not concern leasing new
federal coal but only sought to expand Signal Peak’s mining operation to the
remaining federal coal lands it had leased. Accordingly, OSMRE was the lead
agency in preparing the 2018 EA, and BLM was only identified as a “cooperator in
preparation” of the 2018 EA that “provided technical review and assistance in the
analysis.”
6
owned minerals.” Interior prepared a second EA, issued a FONSI, and approved

the mining plan modification in 2015.

Plaintiffs filed a complaint in the United States District Court for the District

of Montana challenging Interior’s 2015 EA, FONSI, and approval of the Mine

Expansion on several different grounds. Mont. Env’t Info. Ctr., 274 F. Supp. 3d at

1084–85. Relevant here, plaintiffs argued Interior arbitrarily and capriciously

quantified the socioeconomic benefits of the Mine Expansion while failing to use

an available metric called the Social Cost of Carbon (SCC) to quantify the costs of

GHG emissions. Id. at 1094–99. The district court agreed, reasoning that because

the SCC was available and capable of quantifying the costs of GHG emissions,

Interior improperly “place[d] [its] thumb on the scale by inflating the benefits of

the [Mine Expansion] while minimizing its impacts.” Id. at 1098. The district

court partially granted plaintiffs’ motion for summary judgment, vacated the 2015

EA, and enjoined mining of federal coal in the expanded Mine area pending

Interior’s compliance with NEPA.

On remand from the district court, Interior completed a third EA and FONSI

and again approved Signal Peak’s Mine Expansion in 2018. Interior’s 2018 EA

declined to employ the SCC to quantify the costs of the project’s anticipated GHG

emissions for four reasons: (1) the SCC was originally developed for use in

7
rulemakings, not individual adjudications; (2) the technical supporting documents

and associated guidance underyling the SCC had been withdrawn; (3) NEPA does

not require agencies to perform cost-benefit analyses; and (4) the 2018 EA did not

fully quantify the social benefits of “coal-fired energy production,” and therefore

using the SCC to quantify the costs of GHG emissions from the Mine Expansion

“would yield information that is both potentially inaccurate and not useful.”3

Plaintiffs returned to district court to challenge Interior’s 2018 EA, FONSI,

and approval of the Mine Expansion. Plaintiffs’ first argument was that Interior

violated NEPA again by declining to employ the SCC analysis. 350 Montana v.

Bernhardt, 443 F. Supp. 3d 1185, 1197 (D. Mont. 2020). Plaintiffs also argued:

Signal Peak argues the Office acted reasonably when it quantified the
greenhouse gas emissions from the mine expansion, calculated what
percentage of total annual global emissions the mine’s emissions
represent (0.04%), and determined that the mine expansion’s
contribution would be minor. (Doc. 42 at 16.) The comparison of the
mine expansion’s emissions to global emissions is not reasonable; it is
misleading; and it is unlawful. See supra note 10. It is easy, but
misleading, to make highly significant effects appear trivial, merely
by swelling the denominator, as the EA did. Sw. Elec. Power Co. v.
EPA, 920 F.3d 999, 1032-33 (5th Cir. 2019) (a “very small portion” of
a “gargantuan source of [harmful] pollution” may nevertheless

3
Concerning the SCC’s accuracy, the 2018 EA explained that “the
dollar cost figure [produced by the SCC] is generated in a range and provides little
benefit in assisting” the decision maker. For example, the 2018 EA noted that the
SCC produced a cost figure ranging from $4.2 billion to $22.1 billion “depending
on dollar value and the discount rate used.”
8
 “constitute[ ] a gargantuan source of [harmful] pollution on its own
terms”); accord Guardians, 2019 WL 2404860, at *9 (dilution
misleading).

Pls.’ Response-Reply at 15-16, 350 Montana v. Bernhardt, 443 F. Supp. 3d 1185

(D. Mont. 2020) (No. 9:19-CV-12), 2019 WL 4954687. The district court was

persuaded that Interior’s rationale for not using the SCC was supported by the

record and satisfied NEPA. 350 Montana, 443 F. Supp. 3d at 1196. Implicit in the

district court’s ruling was the conclusion that the metric Interior did use constituted

the required “hard look” at the Mine Expansion’s environmental effects and

adequately supported Interior’s FONSI. The district court granted summary

judgment in favor of Interior on all but plaintiffs’ claim that Interior failed to

consider the risk of coal train derailments along the corridor between the Mine site

and the port at Vancouver, British Columbia. Id. at 1202. The district court

vacated the 2018 EA, but not Interior’s approval of the Mine Expansion, and

remanded the matter to Interior to consider the risk of train derailments. Interior

9
has since published a fourth EA that incorporates the 2018 EA and considers the

risk of train derailments for the first time (the 2020 EA).4

Plaintiffs timely appealed. We have jurisdiction pursuant to

28 U.S.C. § 1291.

ii

At the outset, we note a stark contrast between this appeal and previous

cases, in which the impact of GHGs on global warming, climate change, and the

environment was debated. See, e.g., Massachusetts v. E.P.A., 549 U.S. 497,

507–13 (2007) (citation omitted) (discussing the status of the scientific consensus

concerning GHGs and climate change and noting EPA’s determination that

regulating GHG emissions would be unwise because “a causal link between

[GHGs and climate change] cannot be unequivocally established”). Here, the

parties do not dispute that GHGs cause global warming, that global warming

causes climate change, or that human activity is likely the primary cause of these

4
The 2020 EA only addresses the risk of environmental impacts from
train derailments. It incorporated in full the 2018 EA’s analysis and conclusions
relating to GHGs and climate change to determine the Mine Expansion will not
have a significant impact on the environment. U.S. DEP’T OF INTERIOR OFF. OF
SURFACE MINING RECLAMATION AND ENF’T, BULL MOUNTAINS MINE NO. 1
FEDERAL MINING PLAN MODIFICATION ENVIRONMENTAL ASSESSMENT at 11, 15
(Oct. 2020), https://www.osmre.gov/LRG/Projects/docs/102020BullMtnMineEA_
Final.pdf.
10
phenomena.5 Indeed, Interior’s 2018 EA includes dozens of sobering and

unchallenged observations concerning the effects of global warming and climate

change on the environment, including:

• “This period is now the warmest in the history of modern
civilization,” and “[b]ased on extensive evidence, it is extremely
likely that human activities, especially emissions of GHGs, are the
dominant cause of the observed warming since the mid-20th
century.”6

• “Thousands of studies conducted by researchers around the world
have documented changes in surface, atmospheric, and oceanic
temperatures; melting glaciers; diminishing snow cover; shrinking sea
ice; rising sea levels; ocean acidification; and increasing atmospheric
water vapor.”7

5
The 2018 EA explains that “global warming refers to the gradual
increase, observed or projected, in global surface temperature,” while climate
change refers to “[c]hanges in average weather conditions that persist over multiple
decades or longer” and “encompasses both increases and decreases in temperature,
as well as shifts in precipitation, changing risk of certain types of severe weather
events, and changes to other features of the climate system.”
6
U.S. DEP’T OF INTERIOR OFF. OF SURFACE MINING RECLAMATION
AND ENF’T, BULL MOUNTAINS MINE NO. 1 FEDERAL MINING PLAN MODIFICATION
ENVIRONMENTAL ASSESSMENT at D-2–D-4, App’x D (Aug. 2018) (citing U.S.
GLOBAL CHANGE RSCH. PROGRAM, FOURTH NATIONAL CLIMATE ASSESSMENT
(2017)).
7
Id.
11
 • “Global sea level rise has already affected the US; the incidence of
daily tidal flooding is accelerating in more than 25 Atlantic and Gulf
Coast cities.”8

• “Global average sea levels are expected to continue to rise by at least
several inches in the next 15 years and by 1 to 4 feet by 2100. A rise
of as much as 8 feet by 2100 cannot be ruled out.”9

• “The incidence of large forest fires in the western US and Alaska has
increased since the early 1980s and is projected to further increase in
those regions as the climate changes, with profound changes to
regional ecosystems.”10

• “It is very likely that heat waves will occur more often and last longer,
and that extreme precipitation events will become more intense and
frequent in many regions.”11

• “The magnitude of climate change beyond the next few decades will
depend primarily on the amount of GHGs (especially CO2) emitted
globally.”12

• “Continued emission of GHGs will cause further warming and long-
lasting changes in all components of the climate system, increasing

8
Id.
9
Id.
10
Id.
11
Id. (citing INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE
(IPCC), CLIMATE CHANGE 2014: SYNTHESIS REPORT (2014)). We note that the
information contained in the 2014 IPCC report has been updated. See
INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE, CLIMATE CHANGE 2021: THE
PHYSICAL SCIENCE BASIS (2021),
https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_Full_Rep
ort.pdf.
12
Id.
12
 the likelihood of severe, pervasive, and irreversible impacts for people
and ecosystems.”13

Far from reflecting an ongoing debate, the 2018 EA succinctly depicts the impact

of GHGs on the environment in the following graphic illustration: “GHG

emissions and other climate drivers º global warming º climate change º

environmental effects.”

Against this uncontroverted backdrop, Interior found that the Mine

Expansion will have no significant impacts on the climate or the environment

relative to cumulative statewide, national, and global GHG emissions. Interior

based its FONSI on three simple comparisons: (1) a comparison of the total

projected GHG emissions generated by the 11.5 year Mine Expansion project

against total annual global GHG emissions; (2) a comparison of the projected GHG

emissions from the Mine Expansion’s activities in the United States against the

United States’ annual GHG emissions; and (3) a comparison of the projected GHG

emissions from the Mine Expansion’s activities in the United States against

Montana’s annual GHG emissions. Though Interior asserts it “quantifie[d] the

emissions estimated to result from burning the coal . . . [and] analyzes them in the

global, national, and regional contexts,” this statement is somewhat misleading.

13
Id.
13
The comparison of the emissions generated by the Mine Expansion’s activities in

the United States against national GHG emissions and Montana’s emissions did

not account for combustion of the coal overseas; the two domestic comparisons

only considered emissions generated by mining the coal and transporting it to a

port in Vancouver, British Columbia.

II

We review de novo a district court’s order granting summary judgment.

Bark, 958 F.3d at 869. “The Administrative Procedure Act (APA),

5 U.S.C. § 706(2)(A), provides the governing standard for courts reviewing an

agency’s compliance with NEPA . . . .” Id. Pursuant to the APA, we must “hold

unlawful and set aside agency action, findings, and conclusions” that are found to

be “arbitrary, capricious, an abuse of discretion, or otherwise not in accordance

with law.” § 706(2)(A). Agency action is arbitrary and capricious “if the agency

has relied on factors which Congress has not intended it to consider, entirely failed

to consider an important aspect of the problem, offered an explanation for its

decision that runs counter to the evidence before the agency, or is so implausible

that it could not be ascribed to a difference in view or the product of agency

expertise.” Motor Vehicle Mfrs. Ass’n of U.S., Inc. v. State Farm Mut. Auto. Ins.,

463 U.S. 29, 43 (1983).

14
 III

As a threshold issue, Signal Peak argues this case is moot because plaintiffs

challenge the 2018 EA. Signal Peak contends the 2018 EA has been superseded by

the EA Interior published in 2020 after the district court remanded the case to the

agency to consider the risk of train derailments. Interior takes no position on

whether the 2020 EA moots this appeal.

“The doctrine of mootness, which is embedded in Article III’s case or

controversy requirement, requires that an actual, ongoing controversy exist at all

stages of federal court proceedings.” Bayer v. Neiman Marcus Grp., Inc., 861 F.3d

853, 862 (9th Cir. 2017) (citation and internal quotation marks omitted). “The

basic question in determining mootness is whether there is a present controversy as

to which effective relief can be granted.” Id. (citation and internal quotation marks

omitted). An action “‘becomes moot only when it is impossible for a court to grant

any effectual relief whatever to the prevailing party.’” Id. (quoting Chafin v.

Chafin, 568 U.S. 165, 172 (2013)).

Here, though the district court’s 2020 opinion and order vacated the 2018

EA, the court remanded only for Interior to consider the risk of train derailments.

The district court neither vacated Interior’s approval of the Mine Expansion nor

ordered reconsideration of the rest of the 2018 EA, 350 Montana, 443 F. Supp. 3d

15
at 1202, and the 2020 EA unequivocally explained that “[m]ost of the information

provided in the 2018 EA has not changed and, therefore, is herein incorporated by

reference in this EA.”14 Significant for purposes of this appeal, the 2020 EA

incorporated in full the 2018 EA’s analysis of the Mine Expansion’s GHG

emissions and the impact of those emissions on global warming, climate change,

and the environment. Id. at 15.

That the 2018 EA is expressly incorporated into the 2020 EA distinguishes

this case from the cases Signal Peak cites. For example, in Wyoming v. U.S.

Department of Agriculture, 414 F.3d 1207 (10th Cir. 2005), Wyoming challenged

a rule implemented by the U.S. Forest Service. Id. at 1210–11. The rule was

enjoined by the district court and, the day after argument in the circuit court, the

Forest Service “replac[ed]” the challenged rule with a materially different one. Id.

at 1211. Because “[t]he portions of the [original rule] that were substantively

challenged by Wyoming no longer exist[ed],” the Tenth Circuit held that the

parties’ dispute was moot because the court could not “render a decision on the

validity of the now nonexistent [original rule].” Id. at 1212–13. Similarly, in

Theodore Roosevelt Conservation Partnership v. Salazar, the plaintiff argued the

14
DEP’T OF INTERIOR OFF. OF SURFACE MINING RECLAMATION AND
ENF’T, BULL MOUNTAINS MINE NO. 1 FEDERAL MINING PLAN MODIFICATION
ENVIRONMENTAL ASSESSMENT at 1 (Oct. 2020).
16
Bureau of Land Management failed to adhere to the requirements found in a then-

superseded Record of Decision. 661 F.3d 66, 78–79 (D.C. Cir. 2011). Because the

Record of Decision had been superseded, the D.C. Circuit reasoned that it could

“neither invalidate, nor require the Bureau to adhere to, a Record of Decision that

has ‘disappeared into the regulatory netherworld.’” Id. at 79 (quoting Nw. Pipeline

Corp. v. F.E.R.C., 863 F.2d 73, 77 (D.C. Cir. 1988)).

The 2018 EA pertaining to the Mine Expansion has neither disappeared nor

been replaced. The relevant portions of it were expressly incorporated into the

2020 EA and reissued. Accordingly, we retain the ability to order relief in this

case, and the parties’ dispute is not moot.

IV

Plaintiffs argue that Interior violated NEPA by failing to take a “hard look”

at the actual environmental effects of the Mine Expansion’s GHG emissions, and

by failing to provide a convincing statement of reasons for its finding that the Mine

Expansion will not have a significant effect on the environment. Plaintiffs again

press their argument that the agency should have used the Social Cost of Carbon

metric, and also argue that the three comparisons the agency did use fall short of

the mark:

17
 Without some actual analysis of the incremental impacts “it would be
impossible for [an agency] to know whether a change in GHG
emissions of 0.2%, or 1% or 5% or 10% will be a significant step
toward averting the tipping point and irreversible adverse climate
change.” Ctr. For Biological Diversity, 538 F.3d at 1221 (internal
quotation marks and ellipses omitted) (argument of appellant); id. at
1221-23 (accepting argument). . . .

Here, in direct contravention of the teaching of Center for Biological
Diversity, OSM’s analysis of the mine’s 240 million tons of GHG
emissions consisted of nothing more than comparing this figure to
total global GHG emissions and then discounting it as less than one
percent and therefore “minor” and “insignificant.” ER0135-36. As in
Center for Biological Diversity, this unenlightening analysis violated
NEPA.”

“We examine the EA with two purposes in mind: to determine whether it has

adequately considered and elaborated the possible consequences of the proposed

agency action when concluding that it will have no significant impact on the

environment, and whether its determination that no EIS is required is a reasonable

conclusion.” Ctr. for Biological Diversity v. Nat’l Highway Traffic Safety Admin.,

538 F.3d 1172, 1215 (9th Cir. 2008). “Federal agencies must undertake a ‘full and

fair’ analysis of the environmental impacts of their activities,” and “NEPA imposes

procedural requirements designed to force agencies to take a ‘hard look’ at

environmental consequences” of their proposed actions. League of Wilderness

Defs./Blue Mountains Biodiversity Project, 752 F.3d at 762–63 (citation omitted).

To satisfy the “hard look” requirement, an agency must provide “a reasonably

18
thorough discussion of the significant aspects of the probable environmental

consequences.” Ctr. for Biological Diversity, 538 F.3d at 1194 (citation and

internal quotation marks omitted).15

“In reviewing an agency’s decision not to prepare an EIS, the arbitrary and

capricious standard under the APA requires this court ‘to determine whether the

agency has taken a ‘hard look’ at the consequences of its actions, ‘based [its

decision] on a consideration of the relevant factors,’ and provided a ‘convincing

statement of reasons to explain why a project’s impacts are insignificant.’” Barnes

v. U.S. Dep’t of Transp., 655 F.3d 1124, 1132 (9th Cir. 2011) (quoting Env’t Prot.

Info. Ctr. v. U.S. Forest Serv., 451 F.3d 1005, 1009 (9th Cir. 2006)). “The

unequivocal intent of NEPA is to require agencies to consider and give effect to the

environmental goals set forth in the Act”—informing the public and ensuring

agency consideration of the environmental impacts of its actions—“not just to file

detailed impact studies which will fill governmental archives.” Ctr. for Biological

15
Regulations in effect at the time Interior issued its FONSI required
agencies to consider “both context and intensity” when determining whether an
action has a significant effect on the human environment. 40 C.F.R. § 1508.27.
“Context . . . means that the significance of an action must be analyzed in several
contexts such as society as a whole (human, national), the affected region, the
affected interests, and the locality.” Id. § 1508.27(a). “Intensity . . . refers to the
severity of impact.” Id. § 1508.27(b).
19
Diversity, 538 F.3d at 1214–15 (quoting Env’t Def. Fund, Inc. v. Corps of Eng’rs

of U.S. Army, 470 F.2d 289, 298 (8th Cir. 1972)).

The 2018 EA thoroughly supported the relationship between GHG emissions

and climate change and included an unvarnished summary of the broad consensus

that has emerged from the scientific community—that climate change is having,

and is expected to continue to have, alarming effects on our environment. The

2018 EA also calculated that the GHG emissions generated over the life of the

Mine Expansion would total “approximately 0.44 percent of annual (single year)

global GHG emissions.” But in the single sentence that followed, the EA merely

asserted that “while the [Mine Expansion] would contribute to the effects of

climate change,” its “contribution relative to other global sources [of GHGs]

would be minor in the short- and long-term on an annual basis.” With that, the EA

summarily concluded that the Mine Expansion will not have a significant impact

on the environment.

Interior did not cite any scientific evidence supporting the characterization

of the project’s emissions as “minor” compared to global emissions, nor did it

identify any science-based criteria the agency used in its determination. “Without

some articulated criteria for significance in terms of contribution to global

warming that is grounded in the record and available scientific evidence,” id. at

20
1224–25 (internal quotation marks and citation omitted), Interior’s conclusion that

the Mine Expansion’s GHG emissions will be “minor” is deeply troubling and

insufficient to meet Interior’s burden.

Counsel for Interior and Signal Peak both directed the court to Appendix D

as support for Interior’s FONSI. Appendix D is included as an addendum to this

decision. It reflects the scientific community’s agreement that GHGs cause global

warming and climate change, and identifies consequences of climate change that

the agency describes as “profound,” but Appendix D is untethered to the agency’s

conclusion that the Mine Expansion will have no significant impact on the

environment. The reader is left with the agency’s unsupported assertion that the

Mine Expansion’s GHG emissions will be “minor,” which boils down to an

observation that could be applied to any other domestic source of GHGs if

compared to global GHG emissions. Essentially, the EA tells the reader that the

Mine Expansion will add more fuel to the fire but its contribution will be smaller

than the worldwide total of all other sources of GHGs. The reader is left to guess

21
how or why the GHG emissions from the Mine Expansion represent an

insignificant contribution to the environmental consequences identified in the EA.16

The lack of a science-based standard for significance is critical because the

record before us reflects no dispute that GHGs cause global warming and have had

dramatic effects on the environment. The only question is the extent to which this

particular project’s GHGs will add to the severe impacts of climate change. It is

worth repeating that the parties do not dispute the Mine is anticipated to generate

more GHGs annually than the “largest single point source of GHG emissions in the

United States.” When asked at oral argument, Interior did not dispute that if a

project of this scale can be found to have no significant impact, virtually every

domestic source of GHGs may be deemed to have no significant impact as long as

it is measured against total global emissions. Cf. Sw. Elec. Power Co. v. E.P.A.,

920 F.3d 999, 1032 (5th Cir. 2019) (observing, in a Clean Water Act case, that a

pollutant “may form a ‘very small portion’ of a gargantuan source of water

16
See Kevin M. Stack & Michael P. Vandenbergh, The One Percent
Problem, 111 COLUM. L. REV. 1385, 1388 (2011) (“With regard to climate change,
it is natural to frame the problem in global terms; it is a global problem. But once
it is framed that way, the size of the denominator—all activities that produce
[GHGs], viewed globally—is staggering, and this framing makes almost any
source of emissions, including entire industrial sectors within a given country, or
even entire countries,” appear negligible.).
22
pollution” while still “constitut[ing] a gargantuan source of water pollution on its

own terms”).

Plaintiffs argue that our opinion in Center for Biological Diversity requires

reversal of Interior’s FONSI determination. In Center for Biological Diversity, a

group of states and public interest organizations petitioned for review of a final

rule promulgated by the National Highway Traffic Safety Administration

(NHTSA). 538 F.3d at 1180. The EA in that case catalogued the total tonnage of

CO2 emissions that would result from its final rule and compared that number to

the total GHG emissions generated in the United States to forecast that the rule

would “result in cumulative reductions . . . ranging from 0.2 to 0.3 percent of U.S.

greenhouse gas emissions.” Id. at 1215–16. Petitioners challenged the rule

pursuant to the Energy Policy and Conservation Act of 1975 (EPCA) and NEPA,

arguing that NHTSA’s EA violated NEPA because it “fail[ed] to take a ‘hard

look’ at the greenhouse gas implications of its rulemaking and fail[ed] to analyze a

reasonable range of alternatives or examine the rule’s cumulative impact.” Id. at

1181.

In Center for Biological Diversity, we agreed that the final rule failed to

satisfy NEPA’s “hard look” and “convincing statement of reasons” requirements.

Id. at 1181–82, 1220–21. Though the agency determined the projected 0.2 percent

23
decrease in the rate of GHG emissions would not have a significant impact on the

environment, petitioners had argued that other fuel-economy standards would have

yielded a significantly greater reduction in GHG emissions and NHTSA’s

conclusion was “unaccompanied by any analysis or supporting data[.]”17 Id. at

1216–17, 1223. On that record, we concluded the EA did not “provide a

‘statement of reasons’ for a finding of no significant impact, much less a

‘convincing statement of reasons.’” Id. at 1223. Thus, we ordered NHTSA to

prepare a revised EA or, as necessary, a complete EIS. Id. at 1227. Plaintiffs rely

heavily on Center for Biological Diversity to argue that the global and domestic

comparisons supporting the 2018 EA must be rejected because they are not backed

by the “best available science.”

Interior counters that our opinion in Barnes, 655 F.3d at 1139, requires the

conclusion that the FONSI in this case was adequately supported. In Barnes, the

Federal Aviation Administration prepared an EA and FONSI concerning a

proposal to construct a new runway at Hillsboro Airport in Oregon. 655 F.3d at

1126. Relevant here, the FAA’s EA estimated that “global aircraft emissions

17
See Opening Brief of Pub. Int. Petitioners on Nat’l Env’t Pol’y Act
Issue, Ctr. for Biological Diversity v. Nat’l Highway Traffic Safety Admin., 538
F.3d 1172 (9th Cir. 2008) (Nos. 06-71891, 06-72317, 06-72641, 06-72694, 06-
73807, 06-73826), 2006 WL 3884218.
24
account for about 3.5 percent of the total quantity of greenhouse gas from human

activities and that U.S. aviation accounts for about 3 percent of total U.S.

[greenhouse] gas emissions from human sources.” Id. at 1140. Because the

Hillsboro Airport “represent[ed] less than 1 percent of U.S. aviation activity,” the

EA estimated that GHG emissions from existing and future aviation activity at the

airport would “represent less than 0.03 percent of U.S.-based greenhouse gases.”

Id.

Interior calls our attention to Barnes because that case recognized that the

effect of greenhouse gases on climate is a global problem, and we upheld the

agency’s FONSI determination even though part of the FAA’s analysis included a

comparison of the project’s expected emissions against global and domestic GHG

emissions. Id. But Barnes is easily distinguished. The project at issue in that case

was expected to reduce airport congestion and delay, thereby reducing aircraft

ground idle emissions, and the net result was expected to be “long-term, ongoing

emission reductions.” Id. at 1130 (emphasis added). The Mine Expansion

represents a far greater percentage of U.S.-based GHG emissions than the

Hillsboro Airport expansion, and in contrast to the proposal in Barnes, which

represented a reduction in an existing airport’s GHG emissions, the Mine

Expansion unquestionably represents an overall increase in GHG emissions. Our

25
approval of the FONSI in Barnes cannot be stretched to excuse the lack of support

for the EA in this case. See id. at 1140–41 (recognizing that its ruling “creat[ed] no

binding precedent” because “EAs are usually highly specific to the project and the

locale”).

The 2018 EA’s domestic comparisons also failed to provide a convincing

rationale in support of the FONSI, and fell short of NEPA’s requirement that

environmental information be made available to citizens before decisions are

made,18 because the U.S.- and Montana-based comparisons do not account for

emissions generated by combustion of the project’s coal. The district court cited

the EA’s domestic comparisons, 350 Montana, 443 F. Supp. 3d at 1198–99, but

did not specifically discuss that those calculations only include the emissions

generated by mining the coal and transporting it to Vancouver, where it is shipped

overseas. As the EA explains, 97 percent of GHGs from the project will result

from coal combustion, primarily in Japan and the Republic of Korea.

The failure to account for combustion-related emissions in the domestic

comparisons cannot be explained as an attempt to measure the Mine Expansion’s

local impact because there is no question that the coal from the Mine Expansion is

18
40 C.F.R. § 1500.1(b).
26
intended to be sold for combustion.19 The omission of combustion-related

emissions also contradicts a key premise of the 2018 EA—that climate change is a

global problem. None of the parties argue that the fact the coal will be burned

overseas minimizes the significance of the resulting GHGs. Yet when asked at oral

argument about the failure to account for combustion-related emissions, counsel

demurred. Put simply, there is no cogent rationale that justifies excluding

combustion-related emissions from the 2018 EA’s domestic comparisons. The

starting point of the agency’s analysis was its recognition that GHGs are a global

problem. It follows that any meaningful measure of a local point source’s

contribution to global GHGs cannot exclude combustion-related emissions,

regardless of where the coal is burned.20

Notably, Interior’s domestic comparisons in the 2015 EA did include

combustion-related emissions. The 2015 EA “compar[ed] the estimated yearly

19
The partial dissent responds by speculating that Japanese and South
Korean purchasers may stockpile coal rather than burning it. But there is no
indication of this in the record, and neither of the parties engage in similar
speculation.
20
Only the partial dissent suggests that the agency need not concern
itself with the environmental consequences caused by burning the project’s coal
overseas. The EA frankly acknowledges that climate change is a global problem
and that “[t]he magnitude of climate change beyond the next few decades will
depend primarily on the amount of GHGs (especially CO2) emitted globally.” See
supra note 6.
27
amount of greenhouse gas emission from the Mine (23.16 million metric tons) to

the total [annual] amount of greenhouse gas emissions in the United States (6,526

million metric tons in 2012)[.]” Mont. Env’t Info. Ctr., 274 F. Supp. 3d at

1094–95. The 23.16 million metric tons of GHGs included 22.3 million metric

tons (approximately 96.3 percent) of GHGs attributable to the combustion of

shipped coal. Interior offers no explanation for why, after the district court ordered

it to provide more context than it presented in the 2015 EA, see id. at 1101–02, it

backpedaled and omitted combustion-related emissions in the 2018 EA.

The EA’s U.S.- and Montana-based comparisons change dramatically if they

are modified to account for combustion of the Mine Expansion’s coal. The

estimate of the project’s domestic emissions jumps from .04 percent of annual

U.S.-based GHG emissions to approximately 3.33 percent if combustion-generated

emissions are included. And the calculation jumps from 6.43 percent of Montana’s

annual GHG emissions to 519 percent of Montana’s annual GHG emissions if

28
combustion-related GHG emissions are included.21 We do not specify a particular

format for disclosing the projected impact of the project, but a more complete

comparison of the Mine Expansion’s GHG emissions against U.S.- and Montana-

based emissions would go a long way toward contextualizing the significance of

the project’s environmental consequences, as required by NEPA.

40 C.F.R. § 1508.27 (“[T]he significance of an action must be analyzed in several

contexts such as society as a whole (human, national), the affected region, the

affected interests, and the locality.”). For example, the 2018 EA did not explain to

the public that every year the Mine Expansion is in operation, Montana’s annual

21
Plaintiffs argue the project’s GHG emissions would be more than six
times the annual Montana emissions, but they do not detail how they calculated
that estimate and it appears to be somewhat high. Below, we show the same
comparisons Interior used in the 2018 EA, but account for GHG emissions
generated by combustion of the project’s coal. The Mine Expansion represents
approximately 9 years of the 11.5 year project, but the figures below are based on
11.5 years of operation, in keeping with Interior’s calculation.

54,000 = annual global Mt-CO2e.
7,261 = annual US Mt-CO2e.
46.3 = annual Montana Mt-CO2e (2020 projection).
240.1 = total Mine expansion emissions over the life of the project.
240.1 / 11.5 = 20.9 Mt-CO2e = approximate average annual Mine emissions
240.1 / 7,261 = .033 = 3.33%
240.1 / 46.3 = 5.19 = 519%
29
GHG emissions are expected to be about 45 percent greater than that state’s

projected 2020 emissions.22

Our conclusion that the 2018 EA failed to provide a convincing statement of

reasons to explain why the Mine Expansion’s impacts are insignificant begins with

Interior’s own uncontested summary of the scientific evidence concerning the

cause and effects of climate change. The EA describes the consequences of

climate change as “profound,” and explains researchers’ broad consensus that “the

magnitude of climate change beyond the next few decades will depend primarily

on the amount of GHGs (especially CO2) emitted globally.” The only question is

the extent of this project’s contribution to the problem. See 42 U.S.C. § 4332(C);

40 C.F.R. § 1508.13; 40 C.F.R. § 1508.27 (“‘Significantly’ as used in NEPA

requires considerations of . . . intensity,” and intensity “refers to the severity of

impact.”).23 By relying on an opaque comparison to total global emissions and

failing to account for combustion-related emissions in its domestic calculations, the

22
Interior’s analysis used 2020 as the base year for comparing
Montana’s GHG emissions.

20.9 / 46.3 = 0.45 = 45%
23
Title 40 of the Code of Federal Regulations has since been amended.
See 85 Fed. Reg. 43,304, 43,357–76 (July 16, 2020) (amending 40 C.F.R. Parts
1500 et seq.). We cite to the regulations in force at the time Interior published the
2018 EA.
30
2018 EA hid the ball and frustrated NEPA’s purpose. See League of Wilderness

Defs./Blue Mountains Biodiversity Project, 752 F.3d at 761 (“Informed public

participation in reviewing environmental impacts is essential to the proper

functioning of NEPA.”). Interior’s FONSI does not measure up to the “high

quality” and “[a]ccurate scientific analysis” that NEPA’s implementing regulations

demand of environmental information produced by agencies. 40 C.F.R. § 1500.1.

Beginning in its first paragraph, the partial dissent attributes findings to the

agency that it did not make,24 sets up a series of straw man arguments, and

curiously and persistently attributes to this opinion the agency’s quantification of

GHGs, even asserting that “the majority overstates the actual impact of the project

more than ten-fold[.]” The suggestion that plaintiffs barely challenged the

agency’s conclusion that the project’s environmental effects would be “minor” is

refuted by plaintiffs’ arguments, excerpted in this opinion. Our opinion relies on

the three metrics the agency used in its EA—and the agency did indeed compare

24
The partial dissent asserts the agency found “that the incremental
effects of 0.04% of annual global greenhouse gas [] emissions were ‘minor.’” But
the agency made no such finding. Rather, the agency’s 2018 EA found that “total
direct and indirect emissions resulting from mining over 11.5 years would be
approximately 0.44 percent of annual (single year) global GHG emissions (2010).
Therefore, while the Proposed Action would contribute to the effects of climate
change, its contribution relative to other global sources would be minor in the
short- and long-term on an annual basis.”
31
the GHGs emitted over the course of the project to one year of total annual GHG

emissions and concluded, without analysis or elaboration, that the project’s

contributions would be “minor.” The partial dissent’s concern that these are

“apples to oranges” comparisons cannot be correctly aimed at the majority.

Further, it was the agency, not the panel majority, that omitted from the 2018 EA

any consideration of combustion-related GHGs from the domestic calculation of

the project’s GHGs. This omission is particularly glaring because the agency

included the GHGs generated by burning the coal in its 2015 EA domestic

calculations and then stripped the GHGs generated from combustion of the coal out

of the 2018 EA’s domestic calculations.

At oral argument, the agency did not deny that every domestic project,

viewed individually, will generate GHGs that can be described as “minor” when

compared to global GHG emissions. And if domestic measures of this admittedly

global problem omit the GHGs generated by burning the coal overseas, the

calculations provide the public no indication at all of the project’s contributions to

the threat presented by global warming.

V

Plaintiffs also argue that Interior arbitrarily and capriciously failed to use the

Social Cost of Carbon metric to quantify the environmental harms that may result

32
from the project’s GHG emissions. The SCC is “a method of quantifying the

impacts of GHGs” that estimates the harm, in dollars, caused by each incremental

ton of carbon dioxide emitted into the atmosphere in a given year. The SCC was

developed in 2010 by the Interagency Working Group on the Social Cost of

Carbon (IWG), which consisted of experts from various federal agencies, including

Interior.

Plaintiffs strenuously argue that the SCC is “[r]ooted in extensive, peer-

reviewed scientific literature” and has been widely accepted by scientists, agencies,

and courts alike. See, e.g., Zero Zone, Inc. v. U.S. Dep’t of Energy, 832 F.3d 654,

660–61, 677–78 (7th Cir. 2016) (approving the Department of Energy’s use of the

Social Cost of Carbon when considering environmental impacts of two final rules

aimed at improving the energy efficiency of commercial refrigeration equipment);

High Country Conservation Advocs. v. U.S. Forest Serv., 52 F. Supp. 3d 1174,

1189–93 (D. Colo. 2014) (rejecting Forest Service’s contention that there is no

method to predict the impact of one project’s GHG emissions on climate change

because “a tool is and was available: the social cost of carbon protocol”). Another

agency within the Department of Interior, the Bureau of Reclamation, explained in

a draft EIS that “SCC estimates provide valuable and critical insights for decision[]

33
makers and the public as they consider the costs and benefits of alternative policy

choices . . . .”25

Interior did not use the SCC in its 2015 EA, and plaintiffs argued in the

district court that the decision was arbitrary and capricious. The court was

persuaded by plaintiffs’ argument and concluded that Interior’s analysis weighed

the economic benefits of the Mine Expansion but failed to use the SCC to quantify

the resulting environmental harms. When Interior again declined to employ the

SCC in the 2018 EA, it pointed to four reasons:

1) [Interior] is not engaged in a rulemaking for which the
[SCC] protocol was originally developed; 2) the
[Interagency Working Group on Social Cost of
Greenhouse Gases], technical supporting documents, and
associated guidance have been withdrawn; 3) NEPA does
not require cost-benefit analysis; and 4) the full social
benefits of coal-fired energy production have not been
monetized, and quantifying only the costs of GHG
emissions for the project but not other costs and benefits
would yield information that is both potentially
inaccurate and not useful.

Interior’s primary explanation for declining to use the SCC was that the

method is too uncertain to provide a benefit because it produces a wide range of

values to quantify the environmental impacts of incremental GHG emissions. But

25
BUREAU OF RECLAMATION, DRAFT ENVIRONMENTAL IMPACT
STATEMENT: NAVAJO GENERATING STATION-KAYENTA MINE COMPLEX PROJECT
at § 3.2.1 (Sept. 2016), https://www.usbr.gov/ngs/docs/NGS-KMC-DEIS-Text.pdf.
34
it also stressed that the SCC was developed for rule-making. The district court

ruled that Interior adequately explained its decision not to use the SCC and rejected

plaintiffs’ argument that Interior arbitrarily and capriciously declined to employ

the methodology.

On appeal to our court, plaintiffs argue the district court erred because even

the lowest value in the range of estimates generated by the SCC indicates that the

environmental damages caused by the Mine Expansion’s GHG emissions will

significantly exceed the total value of the coal, including all economic benefits.26

Plaintiffs also strenuously argue that the SCC analysis applies with equal

force—and produces equally valid results—to project-level agency decisions as it

does to rulemaking proceedings. But plaintiffs’ arguments overlook that

prescribing a specific metric for the agency to use on remand is not our role. See

Friends of Endangered Species, Inc. v. Jantzen, 760 F.2d 976, 986 (9th Cir. 1985).

“NEPA does not require that we decide whether an [EA] is based on the best

scientific methodology available, nor does NEPA require us to resolve

disagreements among various scientists as to methodology.” Id.; The Lands

Council v. McNair, 537 F.3d 981, 1003 (9th Cir. 2008) (en banc).

26
The SCC produces a range of values depending on the year of the
emissions and the discount rate used.
35
 What NEPA does require is that agencies provide “high quality” information

and “[a]ccurate scientific analysis.” 40 C.F.R. § 1500.1. For the reasons

explained, the global and domestic comparisons employed in the 2018 EA fall

short of that mark. The 2018 EA asserts, without citation or explanation, that

incremental effects of climate change “cannot be attributed to anyone [sic] source

at a small scale.” But NEPA requires that agencies ask a broader question and

consider the direct, indirect, and cumulative effects of proposed agency action. See

Barnes, 655 F.3d at 1136, 1141; 40 C.F.R. §§ 1508.7–8. Interior does not cite any

authority in support of its implied proposition that an agency may decline to

consider evidence relevant to indirect and cumulative impacts simply because it

cannot precisely identify direct effects.

As far as we can tell, Interior resorted to a global comparison of the Mine

Expansion’s GHG emissions because it could not define, with precision, the

incremental impacts of this project’s emissions. Interior suggests that it could do

no better, but the authorities cited in the 2018 EA make plain that the scientific

community’s understanding has advanced considerably since we decided Barnes in

36
2011.27 We are not persuaded by plaintiff’s argument that Interior was required to

use the SCC, but Interior must use some methodology that satisfies NEPA and the

APA. At a minimum, this approach requires providing the information that is

known, and the 2018 EA provided less detail than the 2015 EA. The Mine

Expansion will emit millions of tons of GHGs into the atmosphere, and the bare

comparisons employed in the 2018 EA are of almost no utility in the absence of

additional information concerning the Mine Expansion’s scale and scope relative to

the industry and commodity. Ctr. for Biological Diversity, 538 F.3d at 1223–25.

VI

Plaintiffs urge us to vacate Interior’s approval of the Mine Expansion and

direct Interior to prepare an EIS. “[P]reparation of an EIS is not mandated in all

cases simply because an agency has prepared a deficient EA or otherwise failed to

comply with NEPA,” id. at 1225, but “[p]reparation of an EIS is mandated where

uncertainty may be resolved by further collection of data, or where the collection

27
The agency hedged on its implied assertion that, if the SCC is not
used, no other metrics were available. Interior refers to the Intergovernmental
Panel on Climate Change (IPCC) as “the leading international body for the
assessment of climate change.” The 2018 EA heavily relied upon the fifth edition
of the IPCC’s report. We note that the IPCC’s recently published sixth edition
assessment report integrates and synthesizes scientific, technical, and
socioeconomic studies relevant to understanding the causes and effects of climate
change. See INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE, CLIMATE
CHANGE 2021: The Physical Science Basis (2021).
37
of such data may prevent speculation on potential effects,” Native Ecosystems

Council v. U.S. Forest Service, 428 F.3d 1233, 1240 (9th Cir. 2005) (internal

quotation marks and alteration omitted) (quoting Nat’l Parks & Conservation

Ass’n v. Babbitt, 241 F.3d 722, 731–32 (9th Cir. 2001), abrogation on other

grounds recognized by Monsanto Co. v. Geertson Seed Farms, 561 U.S. 139,

157–58 (2010)); see also Ctr. for Biological Diversity, 538 F.3d at 1225 (If the

evidence in the record demonstrates that a project may have a significant impact, it

is appropriate to remand with instructions to prepare an EIS). On remand, the

district court may reconsider, based on the existing record, whether to order an

EIS, or remand to the agency to determine whether to prepare a new EA or an EIS.

With regard to Interior’s approval of the Mine Expansion, plaintiffs are

correct that vacatur is the presumptive remedy under the APA, Alliance for the

Wild Rockies v. United States Forest Service, 907 F.3d 1105, 1121–22 (9th Cir.

2018), and “[w]e order remand without vacatur only in ‘limited circumstances,’”

Pollinator Stewardship Council v. U.S. Environmental Protection Agency, 806

F.3d 520, 532 (9th Cir. 2015) (quoting Cal. Cmties. Against Toxics v. EPA, 688

F.3d 989, 994 (9th Cir. 2012)). “Whether agency action should be vacated

depends on how serious the agency’s errors are and the disruptive consequences of

38
an interim change that may itself be changed.” Nat’l Family Farm Coal. v. E.P.A.,

966 F.3d 893, 929 (9th Cir. 2020) (quoting Cal. Cmties., 688 F.3d at 992).

Plaintiffs strenuously argue that permitting the Mine Expansion to go

forward while Interior prepares a new, NEPA-compliant EA or EIS will “frustrate

NEPA’s purpose of requiring agencies to look before they leap.” See Robertson v.

Methow Valley Citizens Council, 490 U.S. 332, 349 (1989) (“NEPA ensures that

important effects will not be overlooked or underestimated only to be discovered

after resources have been committed or the die otherwise cast.”).

Plaintiffs’ argument is well taken, but the record is unclear about the extent

to which the agency is capable of resolving uncertainty regarding the magnitude of

the project’s contribution to the environmental harms identified in the EA, and

there is a dearth of evidence concerning the impact of vacatur, including whether

Signal Peak is currently mining federal coal or state coal. See Cal. Cmties. Against

Toxics, 688 F.3d at 993–94 (considering environmental, economic, and energy-

related consequences of vacatur). Additional factfinding is necessary to determine

whether vacatur of the plan approval is warranted at this juncture. See id. We are

mindful of the need for prompt reconsideration of the plan’s approval but must

remand to the district court to make that determination as expeditiously as possible.

39
 The district court’s order is AFFIRMED IN PART, REVERSED IN

PART, and the case is REMANDED to the district court for further proceedings

consistent with this opinion.

40
APPENDIX
 Case: 20-35411, 11/13/2020, ID: 11893224, DktEntry: 20-2, Page 186 of 305

Case 9:19-cv-00012-DWM Document 32 Filed 05/30/19 Page 179 of 355
Appendix D – Climate Change

APPENDIX D - CLIMATE CHANGE
This appendix provides additional information related to climate change to supplement
descriptions of the existing condition (recent conditions and trends) in Section 3.3 and
provides global, national, and regional context (projections) to support impact analysis in
Section 4.3.

1.0 Recent Conditions and Trends

As the leading international body for the assessment of climate change, IPCC reviews and
assesses the most recent scientific, technical and socio-economic information produced
worldwide relevant to the understanding of climate change. IPCC’s fifth assessment report
(IPCC 2014) presents details pertaining to observed climate changes and their causes; future
climate changes, risks and impacts; future pathways for adaptation, mitigation and sustainable
development; and adaptation and mitigation.

IPCC (2014) findings related to recent global conditions and trends include the following.

• Each of the last three decades has been successively warmer at the Earth’s surface than
any preceding decade since 1850. The period from 1983 to 2012 was likely the warmest
30-year period of the last 1400 years in the Northern Hemisphere, where such
assessment is possible.
• The globally averaged combined land and ocean surface temperature data as calculated
by a linear trend show a warming of 0.85 [0.65 to 1.06] °C 2 over the period 1880 to
2012, when multiple independently produced datasets exist. It is extremely likely that
more than half of the observed increase in global average surface temperature from
1951 to 2010 was caused by the anthropogenic increase in GHG concentrations and
other anthropogenic factors together.
• In recent decades, changes in climate have caused impacts on natural and human
systems on all continents and across the oceans. Impacts are due to observed climate
change, irrespective of its cause, indicating the sensitivity of natural and human systems
to changing climate.
• Changes in many extreme weather and climate events have been observed since about
1950. Some of these changes have been linked to human influences, including a decrease
in cold temperature extremes, an increase in warm temperature extremes, an increase
in extreme high sea levels and an increase in the number of heavy precipitation events in
a number of regions.
• In many regions, changing precipitation or melting snow and ice are altering hydrological
systems, affecting water resources in terms of quantity and quality.
• Many terrestrial, freshwater and marine species have shifted their geographic ranges,
seasonal activities, migration patterns, abundances and species interactions in response
to ongoing climate change.
• Studies covering a wide range of regions and crops show that negative impacts of
climate change on crop yields have been more common than positive impacts.

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• Cascading impacts of climate change can now be attributed along chains of evidence
from physical climate through to intermediate systems and then to people.
• At present the worldwide burden of human ill-health from climate change is relatively
small compared with effects of other stressors and is not well quantified.

As a key part of the Fourth National Climate Assessment, the US Global Change Research
Program (USGCRP) oversaw production of a report describing the state of science relating to
climate change and its physical impacts. USGCRP (2017) concluded that the climate of the US is
strongly connected to the changing global climate and provided the following statements
highlighting past and recent conditions related to climate change in the US and the globe.

• Global annually averaged surface air temperature has increased by about 1.8°F (1.0°C)
over the last 115 years (1901–2016). This period is now the warmest in the history of
modern civilization. The last few years have also seen record-breaking, climate-related
weather extremes, and the last three years have been the warmest years on record for
the globe. These trends are expected to continue over climate timescales.
• Based on extensive evidence, it is extremely likely that human activities, especially
emissions of GHGs, are the dominant cause of the observed warming since the mid-
20th century. For the warming over the last century, there is no convincing alternative
explanation supported by the extent of the observational evidence.
• In addition to warming, many other aspects of global climate are changing, primarily in
response to human activities. Thousands of studies conducted by researchers around
the world have documented changes in surface, atmospheric, and oceanic temperatures;
melting glaciers; diminishing snow cover; shrinking sea ice; rising sea levels; ocean
acidification; and increasing atmospheric water vapor.
o For example, global average sea level has risen by about 7–8 inches since 1900,
with almost half (about 3 inches) of that rise occurring since 1993. Human-
caused climate change has made a substantial contribution to this rise since 1900,
contributing to a rate of rise that is greater than during any preceding century in
at least 2,800 years. Global sea level rise has already affected the US; the
incidence of daily tidal flooding is accelerating in more than 25 Atlantic and Gulf
Coast cities.
• Changes in the characteristics of extreme events are particularly important for human
safety, infrastructure, agriculture, water quality and quantity, and natural ecosystems.
Heavy rainfall is increasing in intensity and frequency across the US and globally and is
expected to continue to increase. The largest observed changes in the US have
occurred in the Northeast.
• Heatwaves have become more frequent in the US since the 1960s, while extreme cold
temperatures and cold waves are less frequent. Recent record-setting hot years are
projected to become common in the near future for the US, as annual average
temperatures continue to rise. Annual average temperature over the contiguous US has
increased by 1.8°F (1.0°C) for the period 1901–2016.
• The incidence of large forest fires in the western US and Alaska has increased since the
early 1980s and is projected to further increase in those regions as the climate changes,
with profound changes to regional ecosystems.

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• Annual trends toward earlier spring melt and reduced snowpack are already affecting
water resources in the western US and these trends are expected to continue.
• The global atmospheric carbon dioxide (CO 2 ) concentration has now passed 400 parts
per million (ppm), a level that last occurred about 3 million years ago, when both global
average temperature and sea level were significantly higher than today.
• The observed increase in carbon emissions over the past 15-20 years has been
consistent with higher emissions pathways. In 2014 and 2015, emission growth rates
slowed as economic growth became less carbon-intensive. Even if this slowing trend
continues, however, it is not yet at a rate that would limit global average temperature
change to well below 3.6°F (2°C) above preindustrial levels.

The Montana Climate Assessment (Whitlock et al. 2017) identified the following key messages
about recent trends related to regional climate change in Montana.

• Annual average temperatures, including daily minimums, maximums, and averages, have
risen across Montana between 1950 and 2015. The increases range between 2.0-3.0°F
(1.1-1.7°C) during this period.
• Winter and spring in Montana have experienced the most warming. Average
temperatures during these seasons have risen by 3.9°F (2.2°C) between 1950 and 2015.
• Montana’s growing season length is increasing due to the earlier onset of spring and
more extended summers, and there are more warm days and fewer cool nights. From
1951-2010, the growing season increased by 12 days. In addition, the annual number of
warm days has increased by 2.0 percent, and the annual number of cool nights has
decreased by 4.6 percent over this period.
• Despite no historical changes in average annual precipitation between 1950 and 2015,
there have been changes in average seasonal precipitation over the same period.
Average winter precipitation has decreased by 0.9 inches (2.3 cm), which can mostly be
attributed to natural variability and an increase in El Niño events, especially in the
western and central parts of the state. A significant increase in spring precipitation (1.3-
2.0 inches [3.3-5.1 cm]) has also occurred during this period for the eastern portion of
the state.

The Montana Climate Assessment (Whitlock et al. 2017) also provided findings related climate
change to effects on water, forests, and agriculture, which have been and will continue to be
affected by changes in climate.

2.0 Projected Climate Conditions and Effects

The most recent findings and predictions about climate change and its effects are presented in
IPCC’s report titled Climate Change 2014: Synthesis Report, the Fourth National Climate
Assessment (USGCRP 2017), and Montana Climate Assessment (Whitlock et al 2017). Recent
conditions and trends discussed in Section 1 are expected to continue. Projected effects of
climate change are discussed in each of these documents at varying scales covering a variety of

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topics and resources as summarized below in Section 2.1 to 2.3. In support of Section 4.3.2
of the EA, a detailed discussion of the SCC protocol is provided in Section 2.4

2.1 Global Projections
Projected global climate conditions and effects identified by IPCC (2014) include the following.

• Cumulative emissions of CO 2 largely determine global mean surface warming by the late
21st century and beyond. Projections of GHG emissions vary over a wide range,
depending on both socio-economic development and climate policy.
• Continued emission of GHGs will cause further warming and long-lasting changes in all
components of the climate system, increasing the likelihood of severe, pervasive, and
irreversible impacts for people and ecosystems.
• Surface temperature is projected to rise over the 21st century under all assessed
emission scenarios. It is very likely that heat waves will occur more often and last
longer, and that extreme precipitation events will become more intense and frequent in
many regions. The ocean will continue to warm and acidify, and global mean sea level to
rise.
• Climate change will amplify existing risks and create new risks for natural and human
systems. Risks are unevenly distributed and are generally greater for disadvantaged
people and communities in countries at all levels of development. Increasing magnitudes
of warming increase the likelihood of severe, pervasive and irreversible impacts for
people, species and ecosystems. Continued high emissions (globally) would lead to
mostly negative impacts for biodiversity, ecosystem services and economic development
and amplify risks for livelihoods and for food and human security.
• Many aspects of climate change and its associated impacts will continue for centuries,
even if anthropogenic emissions of GHGs are stopped. The risks of abrupt or
irreversible changes increase as the magnitude of the warming increases.

2.2 National Projections
The Fourth National Climate Assessment (USGCRP 2017) projects changes in temperature and
precipitation, increased frequency of droughts, floods, wildfires, and extreme storms, changes in
land cover and terrestrial biogeochemistry, changes in arctic conditions, sea level rise, and
ocean acidification (and other ocean changes). EPA (2016a) identifies potential subsequent
effects to health and society and ecosystems such as heat-related deaths and illness, disease
spread, changes in growing seasons. Examples of projected effects identified by USGCRP (2017)
include the following.

• Over the next few decades (2021–2050), annual average temperatures are expected to
rise by about 2.5°F for the US, relative to the recent past (average from 1976-2005),
under all plausible future climate scenarios.
• Global average sea levels are expected to continue to rise by at least several inches in
the next 15 years and by 1 to 4 feet by 2100. A rise of as much as 8 feet by 2100 cannot
be ruled out. Sea level rise will be higher than the global average on the East and Gulf
Coasts of the US.

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• The magnitude of climate change beyond the next few decades will depend primarily on
the amount of GHGs (especially CO 2 ) emitted globally. Without major reductions in
emissions, the increase in annual average global temperature relative to preindustrial
times could reach 9°F (5°C) or more by the end of this century. With significant
reductions in emissions, the increase in annual average global temperature could be
limited to 3.6°F (2°C) or less.
• Under higher scenarios, and assuming no change to current water resources
management, chronic, long-duration hydrological drought is increasingly possible before
the end of this century.
• Continued growth in CO 2 emissions over this century and beyond would lead to an
atmospheric concentration not experienced in tens to hundreds of millions of years.
There is broad consensus that the further and the faster the Earth system is pushed
towards warming, the greater the risk of unanticipated changes and impacts, some of
which are potentially large and irreversible.

2.3 Montana Projections
Key projections (effects) identified in the Montana Climate Assessment (Whitlock et al. 2017)
include the following.

• The state of Montana is projected to continue to warm in all geographic locations,
seasons, and under all emission scenarios throughout the 21st century. By mid-century,
Montana temperatures are projected to increase by approximately 4.5-6.0°F (2.5-3.3°C)
depending on the emission scenario. By the end-of-century, Montana temperatures are
projected to increase 5.6- 9.8°F (3.1-5.4°C) depending on the emission scenario. These
state-level changes are larger than the average changes projected globally and nationally.
• The number of days in a year when daily temperature exceeds 90°F (32°C) and the
number of frost-free days is expected to increase across the state and in both emission
scenarios studied. Increases in the number of days above 90°F (32°C) are expected to
be greatest in the eastern part of the state. Increases in the number of frost-free days
are expected to be greatest in the western part of the state.
• Across the state, precipitation is projected to increase in winter, spring, and fall;
precipitation is projected to decrease in summer. The largest increases are expected to
occur during spring in the southern part of the state. The largest decreases are
expected to occur during summer in the central and southern parts of the state.
• Hydrologic impacts may include reduced snowpack; changes in runoff timing,
streamflows and resultant water availability; and increased drought severity and
duration.
• Forest impacts may include: variable impacts to forest-wide processes, but negative
effects of extreme heat; increased forest mortality and net loss of forested areas;
altered forest disturbance regimes; increase in fire risk; increase in bark beetle survival;
and reduction in the amount of carbon stored in forests.
• Agricultural impacts may include both favorable and disruptive effects on crop and
forage; production; less reliable irrigation water; changes to commodity prices; increases

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in native plains vegetation, but declines in forage quality; and an overall increase in the
need for innovation and adaptation to address climate change effects.

2.4 Social Cost of Carbon
A protocol to estimate what is referenced as the “social cost of carbon” (SCC) associated with
GHG emissions was developed by a IWG, to assist agencies in addressing EO 12866, which
requires Federal agencies to assess the domestic costs and the benefits of proposed regulations
as part of their regulatory impact analyses. The SCC is an estimate of the economic damages
associated with an increase in carbon dioxide emissions internationally and is intended to be
used as part of a cost-benefit analysis for proposed rules. As explained in the Executive
Summary of the 2010 SCC Technical Support Document “the purpose of the [SCC]
estimates…is to allow agencies to incorporate the social benefits of reducing carbon dioxide
(CO 2 ) emissions into cost-benefit analyses of regulatory actions that have small, or ‘marginal,’
impacts on cumulative global emissions.” Technical Support Document: Social Cost of Carbon
for Regulatory Impact Analysis under EO 12866 February 2010 (withdrawn by EO13783).
While the SCC protocol was created for regulatory impact analyses during rulemakings, there
have been requests by public commenters or project applicants to expand the use of SCC
estimates to project-level NEPA analyses. These requests are not appropriate for project-level
NEPA analyses for a number of reasons.

First, NEPA does not require a cost-benefit analysis (40 C.F.R. § 1502.23). NEPA requires
agencies to take a hard look at the environmental impacts of their actions. OSMRE completed
an analysis of the potential impacts under all applicable resource areas including air quality and
climate change. OSMRE calculated potential emissions (including greenhouse gases) from mining
operations, transportation, export, and coal combustion. This analysis contained quantitative or
detailed qualitative information. OSMRE evaluated the best available information and the
quantitative and or qualitative analyses provided a reasoned basis for making a choice among
alternatives.

Further, the decision not to expand the use of the SCC protocol for this EA is supported by
the fact that this action is not a rulemaking for which the SCC protocol was originally
developed. On March 28, 2017, the President issued EO 13783 which, among other actions,
withdrew the Technical Support Documents upon which the protocol was based and disbanded
the earlier Interagency Working Group on Social Cost of Greenhouse Gases. The Order
further directed agencies to ensure that estimates of the social cost of GHGs used in regulatory
analyses “are based on the best available science and economics” and are consistent with the
guidance contained in [Office of Management and Budget (OMB)] Circular A-4, “including with
respect to the consideration of domestic versus international impacts and the consideration of
appropriate discount rates” (E.O. 13783, Section 5(c)). In compliance with OMB Circular A-4,
interim protocols have been developed for use in the rulemaking context. However, the
Circular does not apply to project decisions, and there is no other requirement to apply the
SCC protocol to project decisions.

Although NEPA does require consideration of “effects” that include “economic” and “social”
effects (40 C.F.R. 1508.8(b)), without a complete monetary cost-benefit analysis, which would

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include the social benefits of the proposed action to society as a whole and other potential
costs and positive benefits, inclusion solely of an SCC cost analysis would be unbalanced,
potentially inaccurate, and not useful in facilitating an authorized officer’s decision. Any
increased economic activity, in terms of revenue, employment, labor income, total value added,
and output, that is expected to occur with the proposed action is simply an economic impact,
rather than an economic benefit, inasmuch as such impacts might be viewed by another person
as negative or undesirable impacts due to potential increase in local population, competition for
jobs, and concerns that changes in population will change the quality of the local community.
Economic impact is distinct from “economic benefit” as defined in economic theory and
methodology, and the socioeconomic impact analysis required under NEPA is distinct from
cost-benefit analysis, which is not required.

Finally, the SCC, protocol does not measure the actual incremental impacts at the project-level
on the environment and does not include all costs or benefits from carbon emissions. The SCC
protocol estimates economic damages associated with an increase in CO 2 emissions—typically
expressed as a one metric ton increase in a single year—and includes, but is not limited to,
potential changes in net agricultural productivity, human health, and property damages from
increased flood risk over hundreds of years. The estimate is developed by aggregating results
“across models, over time, across regions and impact categories, and across 150,000 scenarios”
(Rose et al. 2014). The dollar cost figure arrived at based on the SCC calculation represents the
value of damages avoided if, ultimately, there is no increase in carbon emissions. But the dollar
cost figure is generated in a range and provides little benefit in assisting the authorized officer’s
decision for project level analyses. For example, in a recent EIS, OSMRE estimated that the
selected alternative had a cumulative SCC ranging from approximately $4.2 billion to $22.1
billion depending on dollar value and the discount rate used. The cumulative SCC for the no
action alternative ranged from $2.0 billion to $10.7 billion. Given the uncertainties associated
with assigning a specific and accurate SCC resulting from 9 additional years of operation under
the mining plan modification, and that the SCC protocol and similar models were developed to
estimate impacts of regulations over long time frames, OSMRE’s ability to evaluate these
impacts on a project-level would be doubtful. 9 This EA does, nonetheless, quantify direct and
indirect GHG emissions and evaluate these emissions in the context of global emissions as
discussed in Section 4.3.1 of the EA.

9
This conclusion is supported in the February 2018 BLM Regulatory Impact Analysis for the Proposed Rule to Rescind or Revise
Certain Requirements of the 2016 Waste Prevention Rule (BLM 2018), noting that “[t]he scientific and economics literature has
further explored known sources of uncertainty related to estimates of the social cost of carbon and other greenhouse gases
noting further that researchers have examined the sensitivity of Integrated Assessment Models (IAMs) and the resulting
estimates to different assumptions embedded in the models (see, e.g., Pindyck 2013, Hope 2013, Anthoff and Tol 2013,
Nordhaus 2014, and Waldhoff et al. 2011, 2014). BLM further spoke to the “additional sources of uncertainty that have not
been fully characterized and explored due to remaining data limitations, concluding that” [a]dditional research is needed to
expand the quantification of various sources of uncertainty in estimates of the social cost of carbon and other greenhouse gases
(e.g., developing explicit probability distributions for more inputs pertaining to climate impacts and their valuation). On damage
functions, other experts have found that those used in most IAMs have no theoretical or empirical foundation, claiming that the
overall model is able to “obtain almost any result one desires” (Pindyck 2013). Naturally, the indeterminate amount of
uncertainty surrounding the IAMs used to approximate social costs for specific greenhouse gas emissions merits additional
research and analysis and further peer-review in order to better ascertain the best available science and economics in
accordance with E.O. 13783.” BLM’s discussion is in the context of a rulemaking for which the SCC was developed. The
uncertainties regarding the applicability of social cost of carbon by OSMRE in the context of a specific project is even greater.

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To summarize, this EA does not undertake an analysis of SCC because 1) it is not engaged in a
rulemaking for which the protocol was originally developed; 2) the IWG, technical supporting
documents, and associated guidance have been withdrawn; 3) NEPA does not require cost-
benefit analysis; and 4) the full social benefits of coal-fired energy production have not been
monetized, and quantifying only the costs of GHG emissions for the project but not other costs
and benefits would yield information that is both potentially inaccurate and not useful.

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 FILED
350 Montana v. Haaland, No. 20-35411 OCT 14 2022
R. NELSON, Circuit Judge, dissenting: MOLLY C. DWYER, CLERK
U.S. COURT OF APPEALS
The agency’s finding that the incremental effects of 0.04% of annual global

greenhouse gas (“GHG”) emissions were “minor” was not arbitrary or capricious

under the Administrative Procedure Act (“APA”). This argument was barely raised,

and the majority’s contrary holding is wrong given our deferential APA review. I

therefore respectfully dissent. 1

The environmental effects of GHG emissions have been hotly contested

publicly and in the courts, particularly in the last three decades. Because neither

political branch has provided any specific direction on how to address the

environmental effects of GHG emissions, the courts are forced to confront this

global environmental issue with outdated laws and regulations. The National

Environmental Policy Act (“NEPA”)—the relevant law here—was passed over 50

years ago. And NEPA’s implementing regulations were first adopted more than 40

years ago, long before the current scientific debate over GHG emissions

materialized.

The courts are ill-equipped to step into highly politicized scientific debates

like this, particularly with so little direction from either the legislative or executive

branch. Indeed, we risk exceeding our own judicial authority in doing so. See

1
I agree with the Majority’s Section III and the portions of Section V that hold that
the agency’s analysis of the Social Cost of Carbon was not arbitrary or capricious.

1
generally Juliana v. United States, 947 F.3d 1159 (9th Cir. 2020) (plaintiffs’ relief

sought was not within the power of an Article III court). Rather than properly

deferring to the other two branches of government—which have evaded the specific

issue before us—the majority now addresses this global issue better left in the first

instance to the political branches, not the judicial branch.

As the majority notes, the Department of the Interior’s Office of Surface

Mining Reclamation and Enforcement (“Interior”) has compiled a breathtaking

record of the potential environmental impacts of GHG emissions. That follows

NEPA’s direction to consider potential environmental impacts. But as Interior

explains, these potential environmental impacts are based on global GHG emissions.

No scientific evidence identified by Interior, the Plaintiffs, or the majority quantifies

the incremental environmental effect caused by GHG emissions of a single project.

The best potential evidence of incremental impact, the Social Cost of Carbon

(“SCC”), was rejected by Interior, and both a skeptical district court and this panel

unanimously have affirmed that conclusion.

There is good reason for the courts to wade cautiously in this area. As Interior

noted, the science of climate change is complex. So complex that the last several

Administrations have failed to provide a consistent way for agencies to analyze the

incremental effects of a single project’s GHG emissions on climate change under

NEPA. No other environmental concern is so intertwined with assumptions of the

2
behavior of 200 other sovereign nations, the supply and demand projections of

global energy models, or the personal energy usage decisions of 7 billion people

worldwide. It strains credibility to assume that such targeted issues can be

adequately analyzed under NEPA with any scientific consensus.

Can we really expect scientists to agree on how many forest fires or other

environmental harms in the proposed action area can be allocated to a 0.04%

increase in annual global GHG emissions? Especially when scientists can hardly

project the global GHG emissions 10 years from now with any similar accuracy?

Yet the majority today demands that Interior do just that—and evaluate or create a

scientific record that by all accounts does not yet exist. Interior explained how this

was a futile effort and the science does not support such an analysis. We have

consistently accorded those agency findings deference. See, e.g., California ex rel.

Imperial Cnty. Air Pollution Control Dist. v. U.S. Dep’t of Interior, 767 F.3d 781,

792 (9th Cir. 2014). And since there is no evidence in the record that the science

has evolved in the last decade to adequately evaluate any significant environmental

impact from, at most, a 0.04% increase in annual global GHG emissions, Interior

was not arbitrary or capricious in analyzing NEPA’s statutory and regulatory

requirements.

The majority errs by concluding that Interior must compare the project’s GHG

emissions to state and national emissions and create science to show the incremental

3
environmental effect caused by 0.04% of annual global GHG emissions. Yet GHG

emissions from coal combustion from foreign sources in Asia over an 11.5-year

period are not relevant to a NEPA analysis of significant environmental effect.

Moreover, local and domestic emissions are not appropriate metrics when analyzing

the effects of global warming, which by all accounts (as the majority agrees) can

only be evaluated—if at all—by global GHG emissions.

I

This case is not about the project’s effect on air quality or some other localized

environmental harm, but Interior’s NEPA analysis of the project’s contribution to

global GHG emissions. We review an agency’s decision under NEPA under the

APA and may “set aside an agency action only if it is ‘arbitrary, capricious, an abuse

of discretion, or otherwise not in accordance with law.’” Barnes v. U.S. Dep’t of

Transp., 655 F.3d 1124, 1132 (9th Cir. 2011) (quoting 5 U.S.C. § 706(2)(A)).

Review under this standard “is narrow, and we do not substitute our judgment for

that of the agency.” Id. We uphold an agency’s decision of a finding of no

significant impact (“FONSI”) if “the agency has taken a hard look at the

consequences of its actions, based its decision on a consideration of the relevant

factors, and provided a convincing statement of reasons to explain why [the]

project’s impacts are insignificant.” Id. (cleaned up). To guide this analysis, I

review the statutory and regulatory framework that controlled Interior’s decision.

4
 A

Congress created an extensive regulatory structure for the leasing of federal

lands for coal production to, among other things, “assure that the coal supply

essential to the Nation’s energy requirements, and to its economic and social well-

being is provided”; to “strike a balance between protection of the environment and

agricultural productivity and the Nation’s need for coal as an essential source of

energy”; and to “encourage the full utilization of coal resources through the

development and application of underground extraction technologies.” 30 U.S.C.

§ 1202(f), (k).

Title 30 thus seeks to balance our nation’s environmental concerns with

economic, energy, and national security interests. Congress has tasked Interior with

this balancing act and authorizes the Secretary to lease federal lands for coal

production. The Secretary can divide lands that “have been classified for coal

leasing into leasing tracts of such size as he finds appropriate and in the public

interest and which will permit the mining of all coal which can be economically

extracted.” Id. § 201(a)(1).

Once land is classified and divided for coal leasing, contemplated leases must

meet several requirements that protect the environment. For example, “[n]o lease

sale shall be held unless the lands containing the coal deposits have been included

in a comprehensive land-use plan and such sale is compatible with such plan,”

5
subject to minor exceptions. Id. § 201(3)(A)(i). Any “coal lease shall contain

provisions requiring compliance with the Federal Water Pollution Control

Act . . . and the Clean Air Act.” Id. § 201(3)(E). And even after a lease is issued,

any company conducting surface coal mining must receive a permit under the

relevant state or federal surface coal mining program. See id. § 1256(a).

The Secretary must also consider the “impacts on the environment” of the

lease and “determine which method or methods or sequence of methods [of mining]

achieves the maximum economic recovery of the coal within the proposed leasing

tract.” Id. § 201(3)(C). Consistent with congressional intent to maximize the

economic benefits of coal, coal leases “shall be for a term of twenty years and for so

long thereafter as coal is produced annually in commercial quantities from that lease.

Any lease which is not producing in commercial quantities at the end of ten years

shall be terminated.” Id. § 207(a). Title 30 thus imposes various requirements to

ensure the Secretary makes informed coal leasing decisions, including balancing

environmental impacts with maximum economic recovery of the coal.

B

As with all agency action, Interior must also conduct a NEPA analysis. NEPA

is remarkably light on substance. Adopted in 1970, the statute requires agencies to

“utilize a systematic, interdisciplinary approach which will insure the integrated use

of the natural and social sciences and the environmental design arts in planning and

6
in decision-making which may have an impact on man’s environment” and “insure

that presently unquantified environmental amenities and values may be given

appropriate consideration in decision-making along with economic and technical

considerations.” 42 U.S.C. § 4332(A), (B). If a major agency action will

“significantly affect[] the quality of the human environment,” the agency must

prepare a detailed statement on:

(i) the environmental impact of the proposed action,

(ii) any adverse environmental effects which cannot be avoided
should the proposal be implemented,

(iii) alternatives to the proposed action,

(iv) the relationship between local short-term uses of man’s
environment and the maintenance and enhancement of long-term
productivity, and

(v) any irreversible and irretrievable commitments of resources
which would be involved in the proposed action should it be
implemented.

Id. § 4332(C).

The implementing regulations in effect when the environmental assessment

(“EA”) in this case was finalized were first adopted in 1978 and provide marginally

more detail. NEPA “does not mandate particular results,” Robertson v. Methow

Valley Citizens Council, 490 U.S. 332, 350 (1989), but “insure[s] that environmental

information is available to public officials and citizens before decisions are made

and before actions are taken,” 40 C.F.R. § 1500.1(b) (all references to the C.F.R. are

7
to the regulations in effect as of August 2018). The agency must first decide the

appropriate level of NEPA review. See id. § 1501.4. Projects that have no

“significant effect on the human environment” are categorically excluded from

NEPA review, id. § 1508.4, while other projects require an EA or environmental

impact statement (“EIS”) when necessary under the relevant agency’s rules. Id.

§§ 1501.3, 1501.4, 1507.3.

After considering all the potential environmental effects, along with existing

science, Interior decided here that an EA was adequate. An EA provides “sufficient

evidence and analysis for determining whether to prepare an environmental impact

statement or a finding of no significant impact; . . . discuss[es] the . . . need for the

proposal[;] alternatives[;] . . . [and] the environmental impacts of the proposed

action and alternatives.” Id. § 1508.9. An agency must prepare a FONSI if the

agency determines, based on the EA, that the proposed action will not have

significant effects. Id. §§ 1501.4(e), 1508.13.

When deciding whether the project substantially affects the environment,

Interior is required only to consider effects from the project that are “reasonably

foreseeable,” id. § 1508.8(b), and have “a reasonably close causal relationship” to

the project, Dep’t of Transp. v. Pub. Citizen, 541 U.S. 752, 767 (2004). Our sister

circuits recognize that “an impact is reasonably foreseeable if it is sufficiently likely

to occur that a person of ordinary prudence would take it into account in reaching a

8
decision” and “does not include highly speculative harms that distort the

decisionmaking process by emphasizing consequences beyond those of greatest

concern to the public and of greatest relevance to the agency’s decision.” City of

Shoreacres v. Waterworth, 420 F.3d 440, 453 (5th Cir. 2005) (first quoting Sierra

Club v. March, 976 F.2d 763, 767 (1st Cir. 1992); then Robertson, 490 U.S. at 354)

(cleaned up).

In addition, “a but for causal relationship is insufficient to make an agency

responsible for a particular effect under NEPA.” Pub. Citizen, 541 U.S. at 767

(internal quotation marks omitted). Instead, there must be “a reasonably close causal

relationship between the environmental effect and the alleged cause,” much like the

“familiar doctrine of proximate cause from tort law.” Id. (internal quotation marks

omitted). “In particular, courts must look to the underlying polices or legislative

intent in order to draw a manageable line between those causal changes that may

make an actor responsible for an effect and those that do not.” Id. (internal quotation

marks omitted). The analysis should not include effects that the agency “has no

ability to prevent . . . due to its limited statutory authority over the relevant actions.”

Id. at 770.2

2
In 2020, after the EA was finalized, NEPA regulations were overhauled for the first
time since 1978. See Update to the Regulations Implementing the Procedural
Provisions of the National Environmental Policy Act, 85 Fed. Reg. 43,304 (July 16,
2020), https://www.govinfo.gov/content/pkg/FR-2020-07-16/pdf/2020-15179.pdf.

9
 C

The Council on Environmental Quality (“CEQ”) has issued guidance to

agencies in conducting NEPA analyses on the effects of GHG emissions. Although

none of the relevant guidance was in effect when Interior issued the EA here, they

provide helpful context. See Young v. United Parcel Serv., Inc., 135 S. Ct. 1338,

1351 (2015) (“‘the rulings, interpretations and opinions’ of an agency charged with

the mission of enforcing a particular statute, ‘while not controlling upon the courts

by reason of their authority, do constitute a body of experience and informed

judgment to which courts and litigants may properly resort for guidance’” (quoting

Skidmore v. Swift & Co., 323 U.S. 134, 140 (1944)).

CEQ issued a final guidance document in 2016. This document recognized

that “[c]limate change is a fundamental environmental issue, . . . [and] a particularly

complex challenge given its global nature and the inherent interrelationships among

its sources, causation, mechanisms of action, and impacts.” CEQ, Final Guidance

for Federal Departments and Agencies on Consideration of Greenhouse Gas

The current Administration has expressed an intent to review these regulations. See
Protecting Public Health and the Environment and Restoring Science to Tackle the
Climate Crisis, 86 Fed. Reg. 7037 (Jan. 25, 2021), https://www.federalregister.gov/
documents/2021/01/25/2021-01765/protecting-public-health-and-the-environment-
and-restoring-science-to-tackle-the-climate-crisis. In the meantime, these
regulations remain in force and control future NEPA analyses. See Wild Virginia.
v. Council on Env’t Quality, 544 F. Supp. 3d 620 (W.D. Va. 2021). Thus, Interior’s
requirements under NEPA on remand may differ substantially from those analyzed
by the majority here.

10
Emissions and the Effects of Climate Change in National Environmental Policy Act

Reviews 2 (Aug. 1, 2016), https://perma.cc/9DM4-4FGU (“2016 Final Guidance”).

Even though it is a “complex challenge,” “agencies need not undertake new research

or analysis of potential climate change impacts in the proposed action area, but may

instead summarize and incorporate by reference the relevant scientific literature.”

Id. at 2, 22. In addition, “[a]gencies should not limit themselves to calculating a

proposed action’s emissions as a percentage of sector, nationwide, or global

emissions in deciding whether or to what extent to consider climate change impacts

under NEPA.” Id. at 11. “[F]or most Federal agency actions CEQ does not expect

that an EIS would be required based solely on the global significance of cumulative

impacts of GHG emissions, as it would not be consistent with the rule of reason to

require the preparation of an EIS for every Federal action that may cause GHG

emissions regardless of the magnitude of those emissions.” Id. at 17.

This guidance was withdrawn in 2017. See Withdrawal of Final Guidance for

Federal Departments and Agencies on Consideration of Greenhouse Gas Emissions

and the Effects of Climate Change in National Environmental Policy Act Reviews,

82 Fed. Reg. 16,576 (Apr. 5, 2017), https://www.govinfo.gov/content/pkg/FR-2017-

04-05/pdf/2017-06770.pdf. New draft guidance was released in 2019. See Draft

National Environmental Policy Act Guidance on Consideration of Greenhouse Gas

Emissions, 84 Fed. Reg. 30,097 (June 26, 2019), https://perma.cc/H7Q6-GQUK

11
(“2019 Draft Guidance”). The 2019 Draft Guidance also recognized that “the

potential effects of GHG emissions are inherently a global cumulative effect.

Therefore, a separate cumulative effects analysis is not required.” Id. at 30,098. And

it confirmed that agencies “shall conduct NEPA analyses based on current scientific

information and methods to the extent reasonably available and practicable,” and

thus are not required to create new science. Id.

The 2019 Draft Guidance was withdrawn in early 2021. See National

Environmental Policy Act Guidance on Consideration of Greenhouse Gas

Emissions, 86 Fed. Reg. 10,252 (Feb. 19, 2021), https://www.govinfo.gov/content/

pkg/FR-2021-02-19/pdf/2021-03355.pdf. CEQ stated its intention to “address in a

separate notice its review of and any appropriate revisions and updates to the 2016

GHG Guidance. In the interim, agencies should consider all available tools and

resources in assessing GHG emissions and climate change effects of their proposed

actions, including, as appropriate and relevant, the 2016 GHG Guidance.” Id.

D

In recognition of the various guidance and regulations dealing with GHG

emissions in NEPA analyses, Interior’s EA for this project extensively details the

effects of GHG emissions on global warming and climate change. The EA

acknowledges that “[t]hrough complex interactions on a global scale, the emissions

of GHGs, along with other climate-influencing environmental factors, cause a net

12
warming of the atmosphere.” This global warming then “contribute[s] to climate

change . . . [which then] contributes to environmental effects around the globe.”

The EA also provides the GHG emissions for the entire life of the proposed

project (240.1 Mt-CO2e), while noting that “[n]early all (99 percent) of GHGs [from

the project] are emitted outside of the US and 97 percent are a result of coal

combustion.” It also states that per year, “[g]lobal anthropogenic GHG emissions

totaled approximately 54,000 Mt-CO2e,” United States emissions “approximately

7,261 Mt-CO2e,” and Montana emissions “approximately 40.7 Mt-CO2e.” The EA

notes that both countries that will be using the coal, South Korea and Japan, “have

both submitted . . . GHG emissions reduction plans . . . [that] may reduce GHG

emissions relative to these estimates during the life of the Proposed Action.”

The EA thoroughly summarizes that GHG emissions, as a whole, could cause

climate change globally, nationally, and in Montana. Possible global effects include

“heat waves [that] will occur more often and last longer[;] . . . extreme precipitation

events [that] will become more intense and frequent in many

regions[;] . . . warm[ing] and acidif[ication]” of oceans; sea level rise; and “mostly

negative impacts [on] biodiversity, ecosystem services and economic development

and amplify[ied] risks for livelihoods and for food and human security.” National

projections include “changes in temperature and precipitation, increased frequency

of droughts, floods, wildfires, and extreme storms[;] changes in land cover and

13
terrestrial biogeochemistry[;] changes in arctic conditions[;] sea level rise[;] and

ocean acidification (and other ocean changes)”; and “potential subsequent effects to

health and society and ecosystems such as heat-related deaths and illness, disease

spread, [and] changes in growing seasons.” Finally, the “state of Montana is

projected to continue to warm in all geographic locations”; experience increased

precipitation “in winter, spring, and fall,” and decreased precipitation “in

summer[;] . . . reduced snowpack; changes in runoff timing, streamflows and

resultant water availability; . . . increased drought severity and

duration[;] . . . increased forest mortality and net loss of forested areas; altered forest

disturbance regimes; increase in fire risk; increase in bark beetle

survival; . . . reduction in the amount of carbon stored in forests[;] . . . [and] both

favorable and disruptive effects on” agriculture.

After detailing the possible effects on climate change from continued and

increasing GHG emissions, the EA analyzed the suitability of quantifying project-

specific effects using SCC. Interior found SCC “not appropriate for project-level

NEPA analyses for a number of reasons. First, NEPA does not require a cost-benefit

analysis. (40 C.F.R. § 1502.23).” Additionally, SCC “does not measure the actual

incremental impacts at the project-level on the environment and does not include all

costs or benefits from carbon emissions.” “The dollar cost figure arrived at based

on the SCC calculation represents the value of damages avoided if, ultimately, there

14
is no increase in carbon emissions.” This “dollar cost figure is generated in a range,”

however, and this range can vary wildly “depending on the dollar value and the

discount range used.”

E

Reviewing Interior’s EA, the district court recognized that it “previously held

that the [prior] EA failed to adequately assess the impacts of [GHG emissions] from

the combustion of coal mined,” because it failed “to quantify the costs of [GHG]

emissions . . . [when SCC] protocol was an available tool to measure the costs.” 350

Montana v. Bernhardt, 443 F. Supp. 3d 1185, 1195–96 (D. Mont. 2020). The new

EA “concludes that the [SCC] protocol is too uncertain and indeterminate to be

useful to the analysis” and discusses and cites “five academic publications and a

Bureau of Land Management report on the indeterminacy of the [SCC] protocol.”

Id. at 1196. Thus, its conclusion “that the protocol is too uncertain and indeterminate

to aid its decision” is “supported [by] the record” and the district court held it

satisfied NEPA. Id. The district court also acknowledged that the EA “quantifie[d]

increases in global, national, and local emissions. . . . Indeed, Plaintiffs [did] not

challenge [Interior’s] qualitative discussion of the impacts of greenhouse gases,

which, as this Court previously noted, was thorough.” Id. at 1198.

15
 II

A

The majority concludes Interior’s actions were arbitrary or capricious

because, in its view, Interior did not adequately explain its evaluation that the

project’s contribution to climate change would be “minor.” Majority at 20–22. But

the EA quantifies the project’s GHG emissions from coal combustion and details the

possible harm caused by climate change. The EA also details that there are no

scientific standards by which to measure the project’s incremental contributions to

climate change. The majority ignores the fact that federal laws and regulations direct

Interior not to consider effects that it “has no ability to prevent . . . due to its limited

statutory authority over the relevant actions.” Pub. Citizen, 541 U.S. at 770.

The majority’s rationale is based on faulty calculations and legally irrelevant

assumptions. First, although the analysis in the EA uses the total emissions from the

life of the project (projected to be 11.5 years) for its comparisons, the majority then

punishes Interior for its conservative projections by using this information to

compare the total emissions from the entire life of the project to a single year of

emissions either globally, from the United States, or from Montana. See Majority at

28–29. Even if project emissions were compared to overall emissions, the units used

to make the comparison must be the same. By comparing the emissions of the 11.5-

year project to a single year from other sources, the majority overstates the actual

16
impact of the project more than ten-fold, concluding that the project would emit

0.44% of annual GHG emissions rather than accurately noting it would be just

0.04%.

Second, the EA notes “[n]early all (99 percent) of GHGs [from the project]

are emitted outside of the US and 97 percent are a result of coal combustion” that

will occur in Japan or Korea. But the majority would require Interior to explicitly

compare emissions from this foreign combustion to annual emissions in Montana

and the United States, noting that the 2018 EA did not include these calculations

while the 2015 EA did. Not only did the 2018 EA provide all the data to make this

comparison, neither NEPA nor its implementing regulations impose any such

requirement in the first place. There is no requirement that an agency cannot remove

irrelevant and unhelpful calculations from later EA iterations, especially when any

concerned citizen with a basic calculator or pencil and paper can instantly make the

same comparison with the provided data.

Third, it is not obvious that the coal from the project will be used within the

life of the project, and such emissions from foreign sovereign’s decision to use coal

almost certainly qualify as effects that Interior “has no ability to prevent . . . due to

its limited statutory authority over the relevant actions.” Pub. Citizen, 541 U.S. at

770. The coal could be combusted over a longer period or stockpiled for

emergencies and not used at all. Moreover, as the EA notes, South Korea and Japan

17
“have both submitted” plans that may reduce GHG emissions “during the life of the

Proposed Action.” And even if the project is not approved, we can hardly say that

South Korea and Japan would cease coal-burning activity. It is almost certain that

these countries would replace the coal from the proposed project with coal mined

elsewhere. This is because the project’s “share of the East Asian steam coal export

market,” which includes South Korea and Japan, “is very small, 6 tenths of one

percent . . . [and] if the mine extension were not allowed, other sellers to the East

Asian steam coal export market would replace the coal that would have been

produced by [the project] and [GHG] emissions would remain

unchanged. . . . Hence, the Bull Mountains mine extension likely would have no

impact on [GHG] emissions.”

Even more inexplicable is what is omitted from the majority’s comparison to

the United States’ and Montana’s annual emissions. Although the majority insists

that the project’s emissions must include the GHG emissions created by the

combustion of coal in Japan or Korea, the emission values from the United States

and Montana do not include emissions from fuel mined from those locations and

combusted elsewhere. See Ctr. for Climate Strategies, Montana Greenhouse Gas

Inventory and Reference Case Projects 1990-2020, Table ES-1 (2007),

https://perma.cc/X9CY-8FC9. Again, the majority compares apples to oranges.

18
 But even if we compared apples to apples, the project’s emissions should not,

as the majority requires, be compared to Montana’s total emissions. Under the

majority’s rationale, if the project was in California or New York, where statewide

GHG emissions far exceed those of Montana, it would have less local environmental

effect on climate change. 3 If this case dealt with air or water pollution, or some other

concrete, local environmental harm, this may have been an appropriate comparison.

But as all agree, GHG emissions and climate change are global issues. Thus, a local

project comparison does not make sense for these effects.

B

Even if these statewide and nationwide comparisons were helpful, they are

not legally relevant to the sole question before us: whether there are significant

environmental impacts that prohibit a FONSI under NEPA. To the contrary,

opinions from our court and Executive Branch guidance make clear that global

warming is not a localized problem, but a global problem that requires a global

analysis. See, e.g., Wash. Env’t Council v. Bellon, 732 F.3d 1131, 1143 (9th Cir.

3
See Ctr. for Climate Strategies, Greenhouse Gas Emissions Inventories and
Forecasts for Nine Western States 9 tbl.1, https://perma.cc/XYJ5-GPB5 (gross GHG
emissions for California in 2020 were 659 Mt-CO2e compared to Montana’s 46);
NYSERDA, New York State of Opportunity, New York Greenhouse Gas Inventory
1990-2019 4 fig.S-1 (2019), https://perma.cc/84ES-VBPN (New York’s GHG
emissions for 2016 were 227 Mt-CO2e). These sources all provided GHG emissions
in MMt-CO2e, or million metric tons of CO2 equivalent, while Interior provides
GHG emissions in Mt-CO2e, or million tons of CO2 equivalent. To convert the
MMt-CO2e values to Mt-CO2e, these values were multiplied by 1.102.

19
2013) (“there is limited scientific capability in assessing, detecting, or measuring the

relationship between a certain GHG emission source and localized climate impacts

in a given region”); Barnes, 655 F.3d at 1139 (“the effect of greenhouse gases on

climate is a global problem”); Ctr. for Biological Diversity v. Nat’l Highway Traffic

Safety Admin., 538 F.3d 1172, 1217 (9th Cir. 2008) (“Climate change is largely a

global phenomenon”); 2019 Draft Guidance; 2016 Final Guidance at 11.

The real question is whether the project’s share of global GHG emissions can

be shown to significantly affect the environment and whether the EA provided “a

reasonably thorough discussion of the significant aspects of the probable

environmental consequences” of these emissions. Ctr. for Biological Diversity, 538

F.3d at 1194 (internal quotation marks omitted). To satisfy these requirements,

Interior must “provide sufficient evidence and analysis for” a FONSI and briefly

discuss “the environmental impacts of the proposed action and alternatives.” 40

C.F.R. § 1508.9. But they need not create new science to support their findings and

we generally defer to the agency’s expertise in identifying the relevant metrics to

use in an EA. Imperial Cnty., 767 F.3d at 792.

The asserted flaws with Interior’s EA are not grounded in any NEPA

requirement. Plaintiffs provided no scientific evidence that an incremental increase

of 0.04% of global GHG emissions (if that were the worst-case result) would cause

a significant impact. They argued almost exclusively that Interior should have used

20
a SCC analysis in this case. The majority correctly disposed of this argument as not

required for a NEPA analysis, as it is not the court’s role to “prescrib[e] a specific

metric for the agency to use.” See Majority at 35. And Interior went to great lengths

to fulfill its NEPA obligations: it identified how the project would affect the

environment (including air quality, water quality, and other metrics) and described

the effects of GHG emissions and climate change on a global, national, and state

level. See also Ctr. for Biological Diversity, 538 F.3d at 1217 (agency “must provide

the necessary contextual information about the cumulative and incremental

environmental impacts” of the project); WildEarth Guardians v. Jewell, 738 F.3d

298, 308–11 (D.C. Cir. 2013) (upholding an agency action where the agency

“discussed at length the prevailing scientific consensus on global climate change and

coal mining’s contribution to it”).

It is incongruent for the majority to disregard SCC but insist that an even less

reliable scientific theory, which has no scientific support in the record, can serve as

the basis for finding an agency action arbitrary or capricious. In doing so, the

majority essentially requires Interior to use and analyze “a specific metric,” i.e.,

compare the project’s GHG emissions from foreign coal combustion to local and

domestic emissions. But no one, not even Plaintiffs, has proposed any sort of method

outside of SCC (which the majority rejected) to calculate incremental environmental

harms from GHG emissions. Rather than provide any argument about how to

21
calculate these harms, Plaintiffs and their experts just conclude that “GHG

levels . . . already exceed scientifically recognized safety thresholds” and projects

such as this are “incompatible with the restoration of our planet’s energy balance.”

That statement is so generic it lacks any real meaning and is certainly not the type

of scientific evidence or argument relevant to an agency’s NEPA analysis. Neither

the majority nor Plaintiffs point to any evidence in the record to suggest that science

delineates any specific environmental harm in the action area from (at most) a 0.04%

incremental increase in annual global GHG emissions.

III

So what happens next? I agree with the majority not to vacate Interior’s

approval of the Mine Expansion or direct Interior to prepare an EIS. As the majority

recognizes, “the record is unclear about the extent to which the agency is capable of

resolving uncertainty regarding the magnitude of the project’s contribution to the

environmental harms identified in the EA.” Majority at 39. Given this, however,

the proper remedy would be to remand to Interior without vacatur. See, e.g., Nat’l

Family Farm Coal. v. EPA, 966 F.3d 893, 929 (9th Cir. 2020). Instead, the majority

remands to the district court to determine whether an EIS is appropriate and the

consequences that could follow a possible vacatur.

Remand to the district court, rather than directly to the agency, is questionable

at best. It would be improper for the district court to engage in factfinding to

22
determine the core issue the majority is concerned about: whether Interior can

resolve the pending scientific uncertainty about the incremental effects of a 0.04%

increase in annual GHG gas emissions. Indeed, district court factfinding on this

issue would conflict with the APA, which contemplates federal court review of the

administrative record prepared by the agency. See Ramos v. Wolf, 975 F.3d 872,

900 (9th Cir. 2020) (R. Nelson, J., concurring) (The APA’s “record-review

requirement is not just a meaningless procedural hurdle to overcome, but a

fundamental constitutional protection to government agency action.”). That is why

we normally remand the matter directly to the agency. Any other course risks

violating the separation of powers principle underlying the APA, which limits courts

to reviewing the administrative record.

Another factor favors remand directly to Interior, whether by this court or the

district court on remand. Because of the 2020 overhaul of NEPA regulations,

Interior’s NEPA obligations on remand may differ greatly from those that controlled

the current EA. For instance, those new regulations clarify that environmental

effects are generally not relevant to a NEPA analysis “if they are remote in time,

geographically remote, or the product of a lengthy causal chain.” 40 C.F.R. §

1508.1(g)(2) (2021). It is hard to envision a course where Interior should not be

allowed simply to compile a new administrative record and conduct a new EA

consistent with the existing NEPA regulations on remand.

23
 It is difficult to see why an EIS would be necessary absent some new scientific

evidence detailing the possible incremental environmental effects of a single

project’s GHG emissions. Indeed, an EIS would probably not provide any more

information than was already included in the EA, especially with the questionable

foreseeability of foreign coal combustion and no scientific way to measure the

incremental impact of GHG emissions. At any rate, that analysis is properly

addressed by Interior on remand, not through an ambiguous endeavor by the district

court. Given these considerations, it is hard to see how a vacatur or an EIS should

be ordered pending further action by Interior on remand.

IV

For these reasons, Interior’s FONSI was neither arbitrary nor capricious under

NEPA. And even if it were, the action should be remanded to the agency to compile

a new administrative record and final decision, not to the district court. I respectfully

dissent.

24