WASHINGTON — The Supreme Court is deciding whether federal law prevents states from suing major oil companies for damages caused by climate change—a ruling that could open the door to hundreds of similar lawsuits across the country.

The case, *Suncor Energy (U.S.A.) Inc. v. County Commissioners of Boulder County*, centers on a 2018 lawsuit Boulder County filed against Suncor Energy and Exxon Mobil in Colorado state court, seeking damages for injuries caused by greenhouse gas emissions. It is the first state-level climate damages claim to reach the nation's highest court.

The oil companies argue federal law bars the lawsuit, calling Boulder's effort "an audacious attempt to use state tort law to address the effects of global climate change." They contend it conflicts with the U.S. Constitution and federal energy policy.

Colorado's Supreme Court disagreed, ruling that companies can comply with both federal law and state tort claims. The court reasoned that Boulder's damages suit does not regulate emissions directly, so it does not obstruct federal law's purposes.

The justices' decision will likely determine whether similar lawsuits pending in other states can proceed. Dozens of cities and counties have filed climate damages cases against oil companies, waiting for the Supreme Court to clarify the legal boundaries.