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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsThe U.S. Supreme Court heard arguments on October 5, 2026, in Suncor Energy (U.S.A.) Inc. v. County Commissioners of Boulder County, but no decision was recorded as of October 7. The justices are considering whether federal law precludes Boulder’s state-law climate claims and whether the Court has jurisdiction to review the case now. They are not deciding whether the companies are liable for climate-related harms.
What is the Supreme Court deciding?
The case, No. 25-170, presents two separate questions. The Court added the jurisdiction question when it agreed to hear the case on February 23, 2026.
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- Federal preemption: Does federal law preclude state-law claims seeking relief for injuries allegedly caused by the effects of interstate and international greenhouse-gas emissions on the global climate?
- Jurisdiction: Does the Supreme Court have statutory and Article III jurisdiction to review the state-court ruling before a final judgment on the underlying claims?
The first question concerns the legal availability of the claims; the second concerns whether the Supreme Court may review the Colorado ruling at this stage. Neither question asks the justices to determine the factual merits of Boulder’s allegations.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallWhat is Boulder’s lawsuit about?
Boulder County and the City of Boulder filed the case in Colorado state court on April 17, 2018. San Miguel County was also an original plaintiff, but its claims were transferred to another venue.
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The local governments allege that fossil-fuel companies’ production, promotion, refining, marketing and sale of fossil fuels contributed to climate change and caused harms to local property and residents. Their complaint seeks damages under Colorado common-law claims that include public nuisance, private nuisance, trespass, unjust enrichment and civil conspiracy. These are allegations, not findings that any defendant caused specific losses or is legally responsible for them.
How the parties frame the dispute
Boulder County describes the case as a request for accountability for climate-related damages, rather than an effort to regulate emissions or stop fossil-fuel production. The companies take a different position: they argue that the claims concern a global problem that cannot be resolved through state-law lawsuits.
What did the Colorado Supreme Court rule?
On May 12, 2025, the Supreme Court of Colorado concluded that federal law did not preempt Boulder’s claims and sent the case back for further proceedings. It wrote: “We now conclude that Boulder’s claims are not preempted by federal law and, therefore, the district court did not err in declining to dismiss those claims.”
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That was the Colorado court’s holding, not a decision by the U.S. Supreme Court. The state court did not decide whether Boulder can prove causation, damages or liability. Those issues remain distinct from the preemption question now before the justices.
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How could the Supreme Court’s decision affect the case?
The possible paths turn on two axes: whether the Court can review the state ruling now, and, if it can, whether federal law precludes the claims.
| Jurisdiction ruling | Preemption ruling, if reached | What that would mean for the case |
|---|---|---|
| The Court concludes it has jurisdiction to review the ruling. | It concludes federal law does not preclude the claims. | The Colorado ruling allowing the claims past the preemption challenge remains in place, and the case can continue in state court. Causation, damages and liability would still need to be addressed. |
| The Court concludes it has jurisdiction to review the ruling. | It concludes federal law precludes the claims. | The state-law claims would face the consequence of that preemption ruling; the underlying factual questions would not thereby become findings of liability. |
| The Court concludes it lacks statutory or Article III jurisdiction to review the case at this stage. | The Court does not reach the preemption question. | The Supreme Court would not decide the federal-preemption issue in this review. The Colorado ruling remains the operative state-court ruling, with further proceedings to follow. |
The case may have implications for other state-court climate-damages suits, but the reach of any decision will depend on what the Court actually decides. It is not yet a ruling on the merits of Boulder’s claims or a guaranteed resolution of similar cases.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why the Marshall Fire is relevant—and what it does not show
The Associated Press reported in 2026 that the 2021 Marshall Fire destroyed nearly 1,100 homes, killed two people and caused an estimated $2 billion in total damage. Boulder filed its lawsuit in 2018, before the fire. Those figures provide context about a later local disaster; they do not establish that the fire was part of the original complaint or that any defendant is liable for its losses.
Boulder County’s case page identifies extreme heat, wildfires, drought and poor air quality as local climate concerns. That list reflects the county’s description of its concerns, not judicial findings in this case.
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