Woman Sues Major Oil Firms Over Mother’s Death in Record Heat Dome

Misti Leon is pursuing legal action against a group of major oil companies, including ExxonMobil, Chevron and BP, for the 2021 death of her mother, Juliana Leon, who died of hyperthermia after being found unresponsive in her car during a record-breaking Pacific Northwest heat dome. A Washington state judge has allowed the suit to move forward to the discovery phase, enabling Leon to present scientific evidence that the heat dome would have been “virtually impossible without human-caused climate change.”

The lawsuit is described as the first to hold oil firms accountable for an individual’s death in a climate-linked disaster. Experts cite that roughly 1,200 deaths across the region have been associated with the heat event, and they point to internal industry documents indicating long-standing awareness of climate risks. While numerous state and local governments are also suing oil companies, the federal government has not pursued similar actions, and legislation has been introduced that could shield the industry from liability. Advocacy groups are urging lawmakers to reject such protections.