The U.S. Supreme Court will open its new term by hearing whether Boulder, Colorado, can pursue state-law claims against Exxon Mobil and Suncor Energy for local harms linked to climate change. Boulder alleges the companies’ fossil-fuel production and deceptive marketing contributed to greenhouse-gas buildup, extreme heat, more frequent wildfires and ecosystem damage. Exxon and Suncor, backed by the Trump administration and 26 states, argue that the Constitution and Clean Air Act require a uniform federal approach to interstate and global emissions. Boulder counters that it seeks recovery for local costs arising from allegedly tortious conduct, not regulation of emissions. Justice Samuel Alito has recused himself, leaving eight justices and the possibility of a 4-4 split that would leave the Colorado Supreme Court ruling intact. The court will also consider whether it has jurisdiction to review the state court decision, with a ruling expected by summer 2027.