Supreme Court Opens Term with Pivotal Climate Liability Hearing

Key points

• The Supreme Court will hear arguments on October 5 in Suncor Energy v. Boulder County, the first case of the new term.
• Boulder County seeks billions in damages from ExxonMobil and Suncor for climate-related harms, alleging the companies misled the public about climate risks.
• Justice Samuel Alito has recused himself from the case due to stock holdings in energy companies, creating a risk of a 4-4 split.
• A 4-4 split would uphold the Colorado Supreme Court’s decision allowing the lawsuit to proceed but would not set a national precedent.
• The case could impact dozens of similar climate lawsuits across the U.S., including a major suit by California and other blue states and municipalities.

Background

This case follows a nearly decade-long legal battle over climate liability, with Boulder County suing ExxonMobil and Suncor in 2018. The Colorado Supreme Court ruled in 2025 that the lawsuit could proceed as a public nuisance claim, rejecting federal preemption arguments. The case has been closely watched as a potential precedent for similar lawsuits across the U.S., including a major suit by California and other blue states and municipalities filed in 2023.

How outlets are covering it

The Los Angeles Times and The New York Times emphasize the potential for a broad ruling to clear the way for dozens of similar climate lawsuits nationwide, while The Washington Post editorial board argues that Colorado cannot be allowed to govern emissions in every other state. CNN highlights the role of Justices Clarence Thomas and Neil Gorsuch, noting their recent skepticism of federal preemption arguments in other cases, which could favor Boulder. Legal experts are divided, with some arguing that federal law does not preempt state tort claims, while others contend that regulating climate pollution is inherently a federal issue. The Trump administration has sided with the oil companies, arguing that allowing states to tackle national or international problems would disintegrate the federal system.

Why it matters

The outcome of Suncor Energy v. Boulder County could have sweeping implications for the fossil fuel industry and climate litigation across the U.S. A broad ruling for Boulder could clear the way for dozens of similar lawsuits, potentially forcing oil companies to pay billions in damages. Conversely, a ruling shielding the oil companies could block all climate change suits, including California’s. The case also raises important questions about federalism and the balance of power between state and federal governments in addressing climate change.

What to watch

The Supreme Court will hear arguments on October 5 in Suncor Energy v. Boulder County. The court may also hear other major cases on immigration and guns in the new term. The outcome of the climate case could impact dozens of similar lawsuits across the U.S., and the industry may turn to Congress to shield energy companies from liability claims. A 4-4 split would uphold the lower court’s decision but not set a national precedent, potentially sending the case back to state courts with a return ticket to the Supreme Court within a few years.