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May 28, 2026

U.S. Supreme Court To Decide State Climate Change Case

The case pits Colorado local governments against major oil and gas producers in a dispute over whether state nuisance laws can be used to seek damages for global climate-related harms.

The U.S. Supreme Court will hear a major Colorado climate lawsuit that could determine how far states and local governments can go in holding energy companies financially responsible for alleged harms tied to global climate change.

The justices announced that they will hear oral arguments in Suncor v. Boulder County Commissioners on October 5, the opening day of the Court’s next term.

At the center of the dispute is whether cities and counties can use state nuisance laws to pursue massive damages from oil and gas companies over their alleged contributions to worldwide greenhouse gas emissions.

Boulder County and other local governments argue that Colorado law allows them to seek compensation for climate-related harms occurring within their jurisdictions. Their lawyers maintain that there is no constitutional barrier to states addressing local injuries caused by conduct originating outside their borders.

“There is no constitutional bar to states addressing in-state harms caused by out-of-state conduct,” Boulder County lawyers wrote in a filing cited in the case.

The energy companies strongly disagree. They argue that federal law, particularly the Clean Air Act, already governs emissions that cross state and national borders.

The companies contend that allowing state-based climate lawsuits would effectively let individual states regulate interstate and international emissions, creating conflicts with federal authority and constitutional limits on state power.

“Seeking injury in the form of physical harms allegedly caused by global emissions,” the company’s lawyers argued, “is just an indirect method of regulating interstate and international emissions.”

The dispute has attracted sharply divided views from legal scholars and policy advocates.

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