Supreme Court to Weigh Colorado City's Climate Lawsuit Against Oil Firms

The high court will decide if Boulder can sue fossil fuel producers over climate change impacts.

Published on Feb. 23, 2026

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The Supreme Court agreed to take up an appeal from fossil fuel producers who are seeking to block a lawsuit filed by the city of Boulder, Colorado, that wants to hold them responsible for climate change. The court's decision could have broad implications for numerous other lawsuits filed by state and local governments seeking billions in damages.

Why it matters

This case could set an important precedent on whether cities and states can sue fossil fuel companies for their role in contributing to climate change and its associated costs. The outcome could open the door for more such lawsuits or make it harder for local governments to take legal action against the energy industry.

The details

The appeal follows a decision from the Colorado Supreme Court last year that rejected an effort by Suncor Energy and Exxon Mobil to get Boulder's lawsuit dismissed. The city is arguing the companies knowingly misled the public about climate risks. The industry argues that Boulder 'cannot make energy policy for the entire country' and that federal law should preempt such state-level claims.

  • The Supreme Court agreed to take up the case on February 23, 2026.
  • The Colorado Supreme Court rejected the industry's effort to dismiss the lawsuit last year.

The players

Suncor Energy

An oil and gas company that is one of the defendants in Boulder's lawsuit.

Exxon Mobil

An oil and gas company that is one of the defendants in Boulder's lawsuit.

Boulder, Colorado

The city that filed the lawsuit against fossil fuel producers, arguing they knowingly misled the public about climate risks.

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What they’re saying

“energy companies across the globe will be subject not only to billions of dollars in damages, but also to a multiplicity of rules governing their conduct in any given location, as one city after another seeks to hold the companies liable for fossil-fuel activities anywhere in the world”

— Trump administration

What’s next

The Supreme Court will hear arguments in the case and issue a ruling, which could have major implications for similar lawsuits filed by other cities and states against fossil fuel companies.

The takeaway

This case highlights the growing legal battles between local governments and the fossil fuel industry over who should bear responsibility for the costs of climate change. The Supreme Court's decision could set an important precedent on the ability of cities and states to sue energy companies for their role in contributing to global warming.