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The Supreme Court should not let the scale of climate change make local claims for alleged local harms automatically untouchable. But the case before it is narrower than a verdict on the oil companies: the justices are being asked whether federal law preempts Boulder’s state-law claims and whether the Court can hear the appeal now. As of October 3, 2026, the Court has not ruled; oral argument is scheduled for October 5.
What Boulder is asking the Court to decide
The case is Suncor Energy (U.S.A.) Inc. v. County Commissioners of Boulder County, No. 25-170. Boulder County and the City of Boulder sued Exxon Mobil Corporation and Suncor entities in Colorado state court in April 2018. The Supreme Court granted review on February 23, 2026.
There are two questions. First, do federal law and the Clean Air Act preclude state-law claims seeking relief for injuries allegedly linked to interstate and international greenhouse-gas emissions and their effects on the global climate? Second, does the Supreme Court have statutory and Article III jurisdiction to review the Colorado decision at this stage?
The second question is a real threshold issue, not a technical afterthought. The Colorado Supreme Court sent the case back for further proceedings rather than finally resolving it. Boulder argues that this interlocutory remand means the Supreme Court lacks jurisdiction to hear the companies’ appeal now; the companies argue that the Court can review it.
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What the lawsuit alleges—and what it does not ask for
Boulder’s complaint alleges that the companies’ production, promotion, refining, marketing, and sale of fossil fuels contributed to climate change, and that they concealed or misrepresented risks. It pleads public nuisance, private nuisance, trespass, unjust enrichment, and civil conspiracy. These are allegations, not findings by a court.
The plaintiffs seek money damages for past and future local costs to analyze, prepare for, mitigate, and repair climate impacts, including wildfire response, flood control, drought response, and building damage. The Colorado Supreme Court recorded that Boulder does not seek an injunction against oil and gas operations or sales, or an order controlling emissions. That distinction is central to how the parties characterize the lawsuit: Boulder calls it compensation for local harm; the companies say claims tied to global emissions would in practice regulate conduct beyond Colorado.
How the parties frame the preemption dispute
| Issue | Companies’ position | Boulder’s position |
|---|---|---|
| Requested remedy | Even if framed as damages, state-law claims based on emissions across state and national borders would reach conduct outside Colorado and intrude on federal authority. | The suit seeks compensation for alleged local harms and deceptive marketing, not an injunction regulating emissions. |
| Federal law | The companies argue that constitutional structure and the Clean Air Act’s federal framework preclude the claims. | Boulder argues that, after federal common law was displaced, the question is ordinary statutory preemption—and that the Clean Air Act does not categorically bar this state-law damages action. |
| Interstate and international concerns | The companies contend that allowing one state’s tort law to govern claims connected to interstate and international emissions would interfere with federal authority over interstate pollution and foreign affairs. | Boulder maintains that local damages claims can proceed without regulating emissions. The Court must assess that argument against the companies’ federalism and foreign-affairs objections. |
| Review now | The companies say the Supreme Court can review the Colorado ruling at this point. | Boulder says the ruling is interlocutory and the Court lacks jurisdiction before a final judgment. |
These are the parties’ arguments, not settled conclusions. The justices could address the jurisdiction question before reaching preemption. The Supreme Court’s decision to take the case does not establish that either side is right on the merits.
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In May 2025, the Colorado Supreme Court held that federal law did not preempt the claims as pleaded at the stage before it, then remanded the case for further proceedings. It expressly declined to decide whether the claims ultimately succeed on their merits.
That means the state court did not determine that the companies caused particular climate impacts, misled consumers, or owe damages. The plaintiffs would still have to prove the elements of their claims if the case proceeds. A Supreme Court ruling for the companies could foreclose or constrain similar state-law suits; a ruling for Boulder on preemption would allow this litigation to continue, not establish liability.
Why the dispute matters in Boulder
Boulder County describes the lawsuit as an effort to seek accountability for costs local governments and taxpayers bear, rather than to regulate emissions. The county identifies heat, wildfire, drought, and poor air quality among local concerns. It frames the dispute as: “Who should bear the rising costs of climate impacts on Colorado?” That is the county’s policy framing, not the legal question the Supreme Court has to answer.
The county says Suncor’s Colorado operations supply about 35 percent of the state’s gasoline and diesel demand. That figure is the county’s stated estimate, not an independently verified market measurement. The Associated Press reported that climate change was considered a factor in the 2021 Marshall Fire and that the fire’s damage was estimated at $2 billion. The fire occurred after Boulder filed suit in 2018; it was not the event that prompted the lawsuit.
The industry-side view is also part of the public debate. Phil Goldberg, special counsel for the Manufacturers’ Accountability Project, told the Associated Press: “The problem is that climate change is caused by pretty much everybody living on earth.” That is an advocacy argument about responsibility, not a judicial finding about this case.
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What is at stake beyond this lawsuit
The Court’s ruling could shape whether state and local governments can use state law to seek compensation for alleged local climate harms when the underlying claims involve emissions and conduct crossing borders. The case therefore tests a difficult boundary: whether a damages action can remain a local remedy, or whether its connection to global emissions makes it a matter federal law must control.
Those stakes do not make the result a substitute for a trial. If Boulder prevails on preemption and jurisdiction, the case returns to the process of proving or disproving its allegations. If the companies prevail, the Court may limit or bar this route to state-law recovery, without deciding the broader scientific question of climate change or every possible form of local climate policy.
What to watch at oral argument
At the October 5 argument, the justices will hear both the federal-preemption dispute and the separate challenge to their jurisdiction. The practical questions to track are whether the requested damages are treated as compensation for local injury or as regulation of emissions; how the Clean Air Act bears on the pleaded state-law claims; and whether the Colorado remand is final enough for Supreme Court review.
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