Oil Companies Face Wrongful-Death Lawsuit Over Pacific Northwest Heat Wave as Industry Pushes Immunity Laws

Misti Leon filed a wrongful-death suit against Exxon Mobil, BP, Chevron, Shell and other majors, alleging that their long-standing knowledge of fossil-fuel-driven warming contributed to the extreme heat that killed her mother on the hottest day in state history in June 2021, when temperatures reached 108 °F. A King County judge recently denied the oil companies’ motions to dismiss, allowing the case to move toward discovery and a potential trial.

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Scientists linked the June 2021 “heat dome” over the Pacific Northwest to climate change, describing it as “virtually impossible” without human-caused warming. An estimated 1,200 people died in the region during that week. Investigations have shown Exxon Mobil possessed internal climate risk assessments as early as the 1970s while publicly downplaying the threat. Nationwide, nearly 40 climate-damage lawsuits are pending, with five already in the discovery stage in states such as Massachusetts, Vermont, Connecticut, the District of Columbia and Honolulu.

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The oil sector, coordinated through the American Petroleum Institute, has launched a legislative push to shield companies from climate liability. Republican-led states—including Utah, Iowa, Tennessee, Oklahoma and Louisiana—have enacted laws granting immunity from greenhouse-gas-related suits, while Montana and Utah have narrowed the definition of “public nuisance” to block climate-damage claims. Bills introduced in both chambers of Congress this spring would extend broad immunity nationwide, backed by the API. Investigations reveal ties between Koch Industries, Exxon and conservative groups such as the American Legislative Exchange Council and the American Tort Reform Association. A 2022 executive order from former President Donald Trump directed the Justice Department to prioritize blocking state climate lawsuits; the department later sued Minnesota over its own climate case, arguing that regulation of greenhouse gases falls under federal jurisdiction.

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He noted that the oil lobby’s focus on stopping extreme climate liability policy reflects a perception of growing legal threat.

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• “If these companies have done nothing wrong and they think the law is on their side, why are they lobbying Congress for immunity?” — Mike Meno — Mike Meno, Center for Climate Integrity

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• Heat peak: 108 °F (June 2021)

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• Regional deaths during the heat wave: ~1,200

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• Pending climate lawsuits nationwide: ~40

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• States with newly passed immunity statutes: Utah, Iowa, Tennessee, Oklahoma, Louisiana (plus Montana and Utah’s nuisance reforms)

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