Boulder accuses oil companies of fueling climate change
It is one of many such lawsuits by US jurisdictions
Boulder seeking monetary damages from Exxon and Suncor
By John Kruzel
WASHINGTON, Feb 23 (Reuters) - The U.S. Supreme Court agreed on Monday to hear a bid by ExxonMobil (XOM.N) and Suncor Energy (SU.TO) to scuttle a lawsuit brought by officials in Boulder, Colorado that seeks to hold the oil companies liable for helping to fuel climate change.
The justices took up an appeal by the companies of a lower court’s ruling that let the litigation move forward. The suit alleging state law violations by the companies seeks unspecified monetary damages for costs incurred by Boulder associated with mitigating the impact of climate change.
The Boulder litigation is one of dozens of climate-related lawsuits filed by U.S. jurisdictions against companies that extract, produce, distribute or sell fossil fuels.
The burning of fossil fuels releases greenhouse gases such as carbon dioxide into the atmosphere, causing more of the sun’s heat to be trapped, which leads to a rise in the average global temperature over time.
The Boulder government officials in their 2018 lawsuit accused the U.S.-based Exxon and Canada-based Suncor of misleading the public about the role that their products played in exacerbating climate change while profiting from unchecked fossil fuel sales. The companies deny wrongdoing.
The plaintiffs have said the oil companies should cover past and future costs incurred by the city and county governments for steps taken to mitigate the effects of climate change, citing infrastructure repairs, environmental damage, emergency management and harms to public health.
The companies urged lower courts to dismiss the case, arguing among other things that Boulder’s lawsuit would illegally interfere with the federal regulation of greenhouse gas emissions under the Clean Air Act.
The Colorado Supreme Court in May 2025 denied their request, prompting the appeal to the U.S. Supreme Court.
President Donald Trump’s administration backed the appeal by the oil companies.
The Supreme Court previously turned away a similar bid by Sunoco (SUN.N) and other oil companies to throw out a climate-related lawsuit by Honolulu after Hawaii’s top court allowed it to proceed.
That lawsuit seeks to hold the companies liable for their alleged role in contributing to extreme weather affecting the region, as well as a significant rise in the average sea level along the Honolulu Pacific coastline, a development linked to flooding, erosion and beach loss.
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- The U.S. Supreme Court is set to hear an appeal from ExxonMobil and Suncor Energy regarding a lawsuit from Boulder, Colorado, which seeks to hold the companies accountable for their contributions to climate change.  
- Boulder aims for monetary damages to cover costs related to mitigating climate change effects, while the oil companies claim the lawsuit unlawfully interferes with federal regulations on greenhouse gas emissions.  
- This case is part of a broader trend of climate-related litigation in the U.S., with Boulder’s accusations including misleading the public about the impact of fossil fuels on climate change.

US Supreme Court to hear Exxon and Suncor bid to toss Boulder's climate suit