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Colorado Supreme Court Allows Boulder to Pursue Climate Lawsuit Against ExxonMobil and Suncor

The court ruled 5-2 that state-level claims of nuisance, trespass, unjust enrichment, and civil conspiracy are not preempted by federal law, sending the case back to district court.

Overview

  • Boulder County and the city of Boulder filed the lawsuit in 2018, seeking compensation for climate-related damages caused by ExxonMobil and Suncor’s alleged decades-long misrepresentation of fossil fuel risks.
  • The Colorado Supreme Court ruled that Boulder's claims under state common law are not preempted by federal law, rejecting arguments that the lawsuit amounts to regulating greenhouse gas emissions.
  • The case now returns to Boulder District Court for further proceedings, marking a significant step in state-level climate accountability litigation.
  • Dissenting justices warned of potential 'regulatory chaos' and called for U.S. Supreme Court intervention, highlighting concerns over the broader implications of such lawsuits.
  • Similar lawsuits by municipalities across the U.S. have faced mixed outcomes, with the U.S. Supreme Court consistently declining to intervene in state-level climate cases.