Leon v. Exxon Mobil Corp.

The daughter of a woman who died from hyperthermia in Seattle during the 2021 Pacific Northwest heat dome filed a lawsuit in Washington Superior Court on behalf of her mother’s estate seeking to hold manufacturers, distributors, and sellers of fossil fuels liable for causing the acceleration of climate change and the extreme heat event that caused her mother’s death. The complaint alleged that the defendants had known for decades that fossil fuel combustion was the primary cause of the accumulation of carbon dioxide in the atmosphere and that elevated concentrations of carbon dioxide would increase global temperatures and have “destructive consequences for human and ecological systems.” The complaint alleged that the defendants nonetheless acted to “undermine public certainty about climate science,” to downplay the seriousness of climate change, and to misrepresent their own actions to mitigate greenhouse gas emissions. The complaint alleged that the defendants’ deceptive conduct delayed measures to mitigate and adapt to climate change and was the proximate cause of the plaintiff’s mother’s death. The plaintiff asserted claims of wrongful death and survival under Washington’s wrongful death statute, failure to warn under the Washington Product Liability Act, and public nuisance under Washington’s public nuisance statute. The relief sought included economic and non-economic damages, general and special damages, equitable relief (including a “public education campaign to rectify Defendants’ decades of misinformation” but expressly not including any regulation of fossil fuel activities or greenhouse gas emissions or interference with the defendants’ ability to lobby or petition any government or engage in non-deceptive speech about climate), exemplary or punitive damages, and costs and attorneys’ fees.