Supreme Court weighs climate damage lawsuits against oil companies
The U.S. Supreme Court heard oral arguments on Oct. 5 in Suncor Energy v. Boulder County. The case asks whether federal law bars state and local governments from using state law to seek damages from oil companies over greenhouse gas emissions, and whether the Court has jurisdiction at this stage. Around 60 similar lawsuits are pending nationwide, and the eventual ruling could affect whether they proceed under state law.
The dispute began in 2018, when Boulder County, the city of Boulder, and San Miguel County sued ExxonMobil and Suncor under Colorado law over climate-related costs and alleged public misrepresentations. San Miguel County’s claims were later separated; the Supreme Court case involves only Boulder County and the city of Boulder.
After Colorado’s Supreme Court allowed the case to proceed in May 2025, the companies appealed. The U.S. Supreme Court agreed to hear the case on Feb. 23, 2026, and Justice Samuel Alito did not take part. A decision is expected by June 2027.
The eventual ruling may affect whether roughly 60 pending climate liability suits proceed under state law. State and local governments seeking compensation for climate-related costs could see their paths expand or narrow, while oil and gas companies may face differing legal exposure across jurisdictions. The decision could also clarify the boundary between state and federal authority, affecting residents and communities that bear infrastructure or public health expenses.