Supreme Court of the United States · Official docket →
Suncor Energy (U.S.A.) Inc., et al. v. County Commissioners of Boulder County, et al.
Paid petition · Supreme Court of Colorado, No. 24SA206 · judgment May 12, 2025
Set for argument · October 5, 2026
Pre-decision estimate: 5% cert probability (95% interval 3%–8%)
Before the decision, modestly above the 4.1% base rate. The model weighted this up for counsel who has won certiorari before, a petition filed soon after the judgment below, and a business petitioner.
Questions presented
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Whether federal law precludes state-law claims seeking relief for injuries allegedly caused by the effects of interstate and international greenhouse-gas emissions on the global climate.
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Added by the Court: Whether this Court has statutory and Article III jurisdiction to hear this case.
Counsel of record
For petitioner
Kannon K. Shanmugam
Davis Polk & Wardwell LLP
For respondent
Kevin K. Russell
Russell & Woofter LLC
Case
Conference history
Distributed for 6 conferences
Amicus briefs
12 cert-stage · 69 merits
(41 supporting pet./neither, 28 respondent)
Proceedings
- Aug 26 2026Reply of petitioners Suncor Energy (U.S.A.) Inc., et al. filed. (Distributed)
- Aug 18 2026Letter of amicus curiae of Coalition of Large Tribes filed. (Distributed)
- Aug 12 2026CIRCULATED
- Aug 10 2026Record requested from the Supreme Court of Colorado.
- Aug 10 2026Amicus brief of Ute Indian Tribe of the Uintah and Ouray Reservation not accepted for filing. (August 13, 2026)
- Aug 04 2026SET FOR ARGUMENT on Monday, October 5, 2026.
- Aug 03 2026Brief amicus curiae of Professor Benjamin B. Johnson filed.
- Aug 03 2026Brief amicus curiae of WHEN Justice filed.
- Aug 03 2026Brief amicus curiae of Jonathan H. Adler filed.
- Aug 03 2026Brief amicus curiae of Natural Resources Defense Council filed.
- Aug 03 2026Brief amici curiae of Makah Indian Tribe, et al. filed.
- Aug 03 2026Brief amici curiae of Our Children’s Trust, et al. filed.
- Aug 03 2026Brief amici curiae of Brady Center to Prevent Gun Violence, et al. filed.
- Aug 03 2026Brief amicus curiae of Professor William W. Buzbee filed.
- Aug 03 2026Brief amici curiae of The Local Government Legal Center, et al. filed.
- Aug 03 2026Brief amici curiae of Climate Economists filed.
- Aug 03 2026Brief amici curiae of Senator Sheldon Whitehouse, et al. filed.
- Aug 03 2026Brief amicus curiae of Constitutional Accountability Center filed.
- Aug 03 2026Brief amici curiae of Scott Surovell, Virginia Senate Majority Leader, et al. filed.
- Aug 03 2026Brief amici curiae of Former EPA Administrators, et al. filed.
- Aug 03 2026Brief amicus curiae of Dave Jones filed.
- Aug 03 2026Brief amicus curiae of Alan Morrison filed.
- Aug 03 2026Brief amici curiae of Preemption Scholars filed.
- Aug 03 2026Brief amici curiae of Professor Hillel Y. Levin, et al. filed.
- Aug 03 2026Brief amici curiae of City and County Governments filed.
- Aug 03 2026Brief amici curiae of Former U.S. Government Officials filed.
- Aug 03 2026Brief amici curiae of Scholars of State Courts And Judicial Federalism filed.
- Aug 03 2026Brief amici curiae of Colorado, et al. filed.
- Aug 03 2026Brief amici curiae of Dr. Robert Brulle, et al. filed.
- Aug 03 2026Brief amicus curiae of Public Citizen filed.
- Aug 03 2026Brief amicus curiae of American Association for Justice filed.
- Aug 03 2026Brief amicus curiae of City of New York filed.
- Aug 03 2026Brief amicus curiae of Robert S. Taylor filed.
- Jul 31 2026Brief amici curiae of Colorado Rancher Kathryn Bedell, et al. filed.
- Jul 28 2026Motion of the Solicitor General for leave to participate in oral argument as amicus curiae and for divided argument filed.
- Jul 27 2026Brief of Cty. Comm'rs of Boulder Cty., et al. not accepted for filing. (To be corrected - August 03, 2026)
- Jul 27 2026Brief of respondents Cty. Comm'rs of Boulder Cty., et al. filed.
- Jul 09 2026Amended Corporate Disclosure Statement of petitioners filed.
- Jun 01 2026Erratum Letter of The Center for Environmental Accountability not accepted for filing. (June 02, 2026)
- May 21 2026Amicus brief of Professor Jason Johnston not accepted for filing. (To be resubmitted to reflect the correct party filing, Former State Supreme Court Justices - May 21, 2026)
- May 21 2026Brief amici curiae of Former State Supreme Court Justices filed. (Resubmitted)
- May 21 2026Brief amici curiae of Multinational Energy, Transportation, and Manufacturing Companies filed.
- May 21 2026Brief amicus curiae of The National Association of Manufacturers filed.
- May 21 2026Brief amici curiae of Former State Solicitors General filed.
- May 21 2026Brief amici curiae of Associated Governments of Northwest Colorado, et al. filed.
- May 21 2026Brief amicus curiae of Tennessee filed.
- May 21 2026Brief amicus curiae of Jennifer Hernandez filed.
- May 21 2026Brief amicus curiae of American Free Enterprise Chamber of Commerce filed.
- May 21 2026Brief amicus curiae of Center for Individual Rights filed.
- May 21 2026Brief amicus curiae of Save Our States filed.
- May 21 2026Brief amicus curiae of Government Accountability & Oversight filed.
- May 21 2026Brief amicus curiae of Protect the First Foundation filed.
- May 21 2026Brief amici curiae of Senior Foreign Affairs Official Michael R. Pompeo, et al. filed.
- May 21 2026Brief amici curiae of Washington Legal Foundation, et al. filed.
- May 21 2026Brief amicus curiae of United States filed.
- May 21 2026Brief amicus curiae of The Chamber of Commerce of the United States of America filed.
- May 21 2026Brief amici curiae of Alabama, et al. filed.
- May 21 2026Brief amicus curiae of The Buckeye Institute filed.
- May 21 2026Brief amici curiae of Advancing American Freedom, et al. filed.
- May 21 2026Brief amici curiae of Professor Richard Epstein, et al. filed.
- May 21 2026Brief amicus curiae of CTIA-The Wireless Association filed.
- May 21 2026Brief amicus curiae of Professor Derek T. Muller in support of neither party filed.
- May 21 2026Brief amici curiae of General (Retired) Richard B. Myers, et al. filed.
- May 21 2026Brief amicus curiae of Consumers' Research filed.
- May 21 2026Brief amicus curiae of Breakthrough Institute filed.
- May 21 2026Brief amici curiae of Senator Ted Cruz, et al. filed.
- May 21 2026Brief amicus curiae of Coalition of Large Tribes filed. (Distributed)
- May 21 2026Brief amicus curiae of Professor Jason Johnston filed.
- May 21 2026Brief amicus curiae of American Petroleum Institute filed.
- May 21 2026Brief amici curiae of American Property Casualty Insurance Association, Complex Insurance Claims Litigation Association, and Reinsurance Association of America filed.
- May 21 2026Brief amici curiae of House Majority Leader Steve Scalise, et al. filed.
- May 21 2026Brief amicus curiae of Neutral Principles filed.
- May 21 2026Brief amici curiae of Professor Todd Zywicki, et al. filed.
- May 21 2026Brief amicus curiae of Professor Saikrishna B. Prakash filed.
- May 20 2026Brief amicus curiae of Center for Environmental Accountability filed. (Corrected brief to be filed--June 29, 2026).
- May 20 2026Brief amicus curiae of Center for Environmental Accountability filed. (Corrected)
- May 20 2026Brief amicus curiae of Pacific Legal Foundation filed.
- May 19 2026Brief amicus curiae of American Tort Reform Association filed.
- May 19 2026Brief amici curiae of Frontier Institute, et al. filed.
- May 18 2026Brief amicus curiae of Atlantic Legal Foundation, et al. filed. (Distributed)
- May 15 2026Brief amici curiae of The Pelican Institute For Public Policy, et al. filed.
- May 14 2026Brief of petitioners Suncor Energy (U.S.A.) Inc., et al. filed.
- May 14 2026Joint appendix filed. (Statement of costs filed)
- Mar 11 2026Motion to extend the time to file the briefs on the merits granted. The time to file the joint appendix and petitioners' brief on the merits is extended to and including May 14, 2026. The time to file respondents' brief on the merits is extended to and including July 27, 2026.
- Feb 27 2026Motion for an extension of time to file the briefs on the merits filed.
- Feb 23 2026Petition GRANTED. In addition to the question presented by the petition, the parties are directed to brief and argue the following question: Whether this Court has statutory and Article III jurisdiction to hear this case.
- Feb 13 2026DISTRIBUTED for Conference of 2/20/2026.
- Jan 20 2026DISTRIBUTED for Conference of 1/23/2026.
- Jan 12 2026DISTRIBUTED for Conference of 1/16/2026.
- Jan 05 2026DISTRIBUTED for Conference of 1/9/2026.
- Nov 25 2025DISTRIBUTED for Conference of 12/12/2025.
- Nov 25 2025Reply of petitioners Suncor Energy (U.S.A.) Inc., et al. filed. (Distributed)
- Nov 10 2025Brief of respondents County Commissioners of Boulder County, et al. in opposition filed.
- Oct 09 2025Brief amicus curiae of Professor Jason Johnston filed.
- Oct 09 2025Brief amici curiae of House Majority Leader Steve Scalise, et al. filed.
- Oct 09 2025Brief amicus curiae of National Association of Manufacturers filed.
- Oct 09 2025Brief amicus curiae of Chamber of Commerce of the United States of America filed.
- Sep 26 2025Brief amici curiae of Alabama, et al. filed.
- Sep 25 2025Motion to extend the time to file a response is granted and the time is extended to and including November 10, 2025.
- Sep 24 2025Motion to extend the time to file a response from October 9, 2025 to November 10, 2025, submitted to The Clerk.
- Sep 15 2025Brief amicus curiae of American Petroleum Institute filed.
- Sep 12 2025Brief amicus curiae of American Tort Reform Association filed.
- Sep 11 2025Brief amici curiae of Frontier Institute, et al. filed.
- Sep 11 2025Brief amicus curiae of United States filed.
- Sep 11 2025Brief amici curiae of Atlantic Legal Foundation, et al. filed.
- Sep 11 2025Brief amici curiae of Professor Richard Epstein, et al. filed.
- Sep 09 2025Response Requested. (Due October 9, 2025)
- Sep 05 2025Brief amici curiae of General (Retired) Richard B. Myers, et al. filed.
- Sep 04 2025Letter received from Suncor Energy (U.S.A.) Inc., et al.
- Sep 03 2025DISTRIBUTED for Conference of 9/29/2025.
- Aug 28 2025Waiver of right of respondent Cty. Comm'rs of Boulder Cty., et al. to respond filed.
- Aug 08 2025Petition for a writ of certiorari filed. (Response due September 11, 2025)