Last mentioned: Mar 7, 2026
SCOTUS Intervention
The U.S. Supreme Court officially agrees to take up the appeal from the oil companies.
SCOTUS Hearing
The Supreme Court agrees to hear oral arguments in the appeal, escalating the case to the highest level.
Federal Support
The Trump administration files a brief supporting the oil companies' bid for Supreme Court review.
SCOTUS Petition
ExxonMobil and Suncor petition the U.S. Supreme Court to review the jurisdictional question.
10th Circuit Ruling
The appeals court affirms that the case belongs in state court, rejecting the energy companies' jurisdictional arguments.
Lower Court Ruling
A lower court allows the litigation to proceed under state law, rejecting company motions to dismiss.
Lawsuit Filed
Boulder, Colorado, files suit against ExxonMobil and Suncor Energy over climate change impacts.
Lawsuit Filed
Boulder and San Miguel County file suit against ExxonMobil and Suncor in Colorado state court.
The U.S. Supreme Court has granted a petition by ExxonMobil and Suncor Energy to review a lower court ruling that allowed climate-related lawsuits from Colorado local governments to proceed. This decision marks a critical turning point for dozens of similar cases nationwide seeking to hold fossil fuel companies financially liable for climate change impacts.
The U.S. Supreme Court has agreed to hear an appeal in a long-running climate liability lawsuit filed by the city and county of Boulder, Colorado. The ruling could determine whether dozens of similar local climate cases across the country can proceed in state courts or must be dismissed under federal law.