Justices divided over climate change case and liability for oil producers

The Supreme Court faced an uncertain outcome in a landmark climate change case on Monday, as justices appeared divided over whether local governments can sue oil producers for potential billions in damages due to alleged deceptive marketing and the consequences of global warming. Boulder, Colorado, initiated the case against Exxon Mobil and Suncor Energy, and requires only four votes to secure a victory.

A win for the city would pave the way for similar claims in state courts across the nation, but it would not likely resolve the dispute conclusively. The case centers on the assertion that state law should govern global conduct, with Boulder's attorney Kevin Russell arguing that financial damages are not about regulating or shutting down companies, but rather about recovering costs from alleged harms caused by deceptive marketing and dangerous side-effects of fossil fuels.

Russell further contended that when one entity harms another on a national or international scale, federal law should be the remedy, not state-by-state rules. However, Exxon Mobil and Suncor's attorney Kannon Shanmugam contended that the Constitution, federal law, and Supreme Court precedent make it clear that air and water pollution matters fall under federal jurisdiction, not state laws.

Shanmugam argued that if Boulder’s claims are allowed, 90,000 municipalities nationwide could potentially impact national and international energy policy by requesting juries to impose catastrophic damages on select fossil-fuel producers. During the oral arguments, Justice Elena Kagan expressed sympathy for Boulder’s argument, drawing parallels to class-action lawsuits against tobacco companies and opioid manufacturers.

Justice Brett Kavanaugh, on the other hand, seemed more inclined to support Exxon and Suncor, citing a "wall of precedent" that supports barring state lawsuits against the companies due to the transboundary nature of air and water pollution. Chief Justice John Roberts questioned both sides, suggesting that existing traditions may support Boulder’s suit but also expressing concerns about the nationwide implications of permitting such lawsuits to proceed. A decision in the case, Suncor v. Boulder, is anticipated by the end of June 2027.