Supreme Court Splinters on Boulder Climate Lawsuit

There is a particular difficulty that arises when the law must confront a problem as vast and diffuse as a warming planet—a problem that does not fit neatly into the categories the legal system was designed to address, that crosses borders and generations, and that resists the kind of definitive resolution a courtroom is meant to provide. On Monday, as the Supreme Court opened its new term, that difficulty was on full display. The justices heard nearly two hours of argument in Suncor Energy v. County Commissioners of Boulder County, a case that will determine whether state and local governments can sue fossil fuel companies for the damages of climate change. And by the end of the session, it was not at all clear how the court would rule .

The case began in 2018, when the city and county of Boulder, Colorado, sued ExxonMobil and Suncor Energy in state court. Boulder alleged that the companies had known for decades that their products were causing climate change, had concealed and misrepresented those dangers, and should therefore share in the costs of the resulting harms—wildfires, droughts, floods, and other damages to public property . The companies argue that federal law, specifically the Clean Air Act, preempts such state claims, and that allowing every municipality to sue would create a chaotic patchwork of regulations .

What made Monday's arguments notable was not a clear ideological split but a genuine uncertainty that seemed to cut across the bench. Chief Justice John Roberts, who might be expected to sympathize with the business interests, pressed the oil companies' lawyer on why this case differed from other mass tort litigation—lawsuits over tobacco or opioids—that state courts have long been allowed to hear. "There are a lot of familiar situations where conduct outside of a state has broad effects on other states… and yet we allow the state courts in a particular state to bring litigation," Roberts said . Justice Elena Kagan pushed even harder, asking the companies' attorney whether the tobacco and opioid suits were "chapters one and two" of the same book—and if so, why chapter three should be preempted .

On the other side, Justices Brett Kavanaugh and Amy Coney Barrett appeared more sympathetic to the companies. Kavanaugh said Supreme Court precedent "make[s] crystal clear that interstate air and water pollution are matters for federal law unless Congress specifically preserves state law" . Barrett suggested that while the Clean Air Act might not wipe out all state authority, the room left for state nuisance claims was "much more circumscribed" than Boulder's broad suit .

The absence of Justice Samuel Alito, who recused himself from the case, adds a layer of uncertainty. With eight justices hearing the case, a 4-4 tie would leave in place the Colorado Supreme Court's decision allowing Boulder's suit to proceed—a result that would be a significant setback for the oil industry without setting a national precedent . Legal observers noted that the outcome may hinge on justices like Clarence Thomas, who asked jurisdictional questions that suggested his vote could be in play, or Kagan, who seemed to be searching for a narrow path that might allow the companies to prevail without embracing their broadest arguments .

For the communities that have filed similar suits across the country, the stakes are enormous. Dozens of state and local governments have brought climate liability cases, and a ruling for the oil companies could shut them all down . A ruling for Boulder would allow them to proceed, though the companies would still have other defenses to raise. The court is expected to decide the case by the end of its term in June or early July. For now, the justices have left the question open, and the litigants—and the public—are left to wait.

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Sources: SCOTUSblog, The New Republic, Roll Call, Vox, The Denver Post, Legal Planet