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What the Supreme Court is being asked to decide
In Suncor Energy (U.S.A.) Inc. v. County Commissioners of Boulder County, No. 25-170, the companies ask the Court to reverse a Colorado Supreme Court ruling that allowed the governments’ claims to proceed. The central question is 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. That is the petitioners’ formulation, not a finding by the Court. The petition sets out the question presented.
The Court also directed the parties to address a separate threshold issue: whether it has statutory and Article III jurisdiction to hear the case. The two questions are distinct. Preemption concerns whether federal law displaces the state-law claims; jurisdiction concerns whether the Supreme Court may review this case at this stage. The Supreme Court docket records the questions and the case’s current schedule.
What the Boulder-area governments allege
Boulder County, San Miguel County and the City of Boulder filed the underlying lawsuit in Colorado state court on April 17, 2018, according to Boulder County’s case history. The governments allege that the companies contributed to climate change and concealed risks associated with their products. They seek relief for alleged harms and costs affecting their communities. These are allegations in a pending case, not judicial findings that the companies are liable.
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The City of Boulder characterizes the suit as a request for local relief under state law, not a request to regulate emissions or halt fossil-fuel production. That description is the plaintiffs’ position; the companies dispute the legal basis for the claims. The City’s case summary and argument notice describe the local governments’ view.
How the companies’ and governments’ legal positions differ
| Issue | Exxon and Suncor | Boulder-area governments | What is before the Court |
|---|---|---|---|
| Federal or state authority | The companies argue that federal law precludes state-law claims tied to the effects of emissions crossing state and national borders. They contend that allowing the claims could let state courts and juries shape national climate policy and produce conflicting rules. | The governments argue that federal law did not preempt their state-law claims, and that the Colorado Supreme Court correctly allowed them to proceed. | Whether federal law displaces these claims. The companies’ arguments are set out in their merits brief; the City summarizes the plaintiffs’ position in its case summary. |
| Nature of the requested relief | The companies characterize claims based on global emissions as matters that cannot be resolved through state tort law. | The City says the suit seeks local relief for alleged local harms, rather than regulation of emissions or an order to stop fossil-fuel production. | Whether the claims operate as state-law remedies for alleged local injury or impermissibly intrude on national authority over emissions. Neither characterization is a Supreme Court holding. |
| Clean Air Act and federal common-law precedents | The companies rely on federal-law arguments, including the Clean Air Act and federal common-law principles, to contend that state claims are displaced. | The governments maintain that federal law does not preempt their claims. | How those federal statutes and precedents apply to these particular claims. The parties’ filings present their arguments; the Court has not resolved them. |
| Supreme Court jurisdiction | The Court has expressly asked whether it has statutory and Article III jurisdiction to review the case. | The Court has directed both sides to address the same threshold question. | The docket identifies the question, but it should not be treated as settled merely because the Court granted review. |
Key dates and current status
| Date | Event |
|---|---|
| April 17, 2018 | Boulder County, San Miguel County and the City of Boulder filed suit in Colorado state court, according to Boulder County. |
| May 2025 | The Colorado Supreme Court ruled that federal law did not preempt Boulder’s claims, as summarized by the City of Boulder. |
| September 11, 2025 | The companies filed their petition asking the U.S. Supreme Court to review the case. |
| February 23, 2026 | The Supreme Court granted review and added the question of its statutory and Article III jurisdiction. |
| May 14, 2026 | The companies filed their merits brief. |
| May 21, 2026 | The docket records an invited amicus brief from the Solicitor General at the petition stage. |
| July 27, 2026 | The governments’ merits brief was filed after an earlier submission was not accepted and was corrected. |
| September 28, 2026 | The Clerk notified the Court that Justice Samuel Alito would not continue to participate. The docket gives no reason. |
| October 5, 2026 | Oral argument is scheduled. The City’s notice lists a 10 a.m. Eastern start time (8 a.m. Mountain); consult the live docket for any schedule changes. |
The procedural entries and current case status are recorded on the Supreme Court docket. As of October 3, 2026, it listed the October 5 argument as upcoming and no merits decision.
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What the case could—and could not—resolve
The immediate issue is whether the claims may proceed, not whether the governments can prove their allegations or what damages, if any, should be awarded. The appeal is not a trial of climate science or a final determination of Exxon’s or Suncor’s liability.
A ruling could affect how similar state and local climate suits proceed, but the nationwide consequences are not decided in advance. The outcome will depend on the Court’s reasoning, including its answer to the jurisdiction question; the docket’s pending status means there is no Supreme Court ruling to apply yet.
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