Yellowstone eruption scenario could upend civilization, study finds

A UK-led study models a Yellowstone supereruption, detailing a cascading sequence from months of increased seismic activity to a cataclysmic blast that could eject ash across North America, cause massive fatalities (0.7–1.3 billion), disrupt infrastructure and food supplies, trigger a global recession, and usher in long-term societal changes — while emphasizing such an eruption is rare and inherently unpredictable.