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gpt-5.4
Nuclear War
The single most likely way the world could end is a large-scale nuclear war, most plausibly triggered by great-power conflict, miscalculation, or escalation from a conventional war. Unlike slower-moving threats, nuclear arsenals already exist, are on alert, and can kill billions directly and indirectly within months.
Current trends make this risk unusually persistent: worsening rivalry among nuclear-armed states, erosion of arms-control agreements, cyber threats to command-and-warning systems, faster weapons that compress decision time, and the possibility that AI-enabled surveillance or decision support could increase false confidence during a crisis. Human error, technical malfunction, or a mistaken interpretation of an attack could be enough.
Even a “limited” exchange could cause global famine through nuclear winter, collapsing food systems and governments far from the battlefield. A full-scale exchange between major powers could destroy modern civilization and plausibly drive humanity to extinction through immediate devastation, radiation, infrastructure failure, disease, and years of climatic shock.
Current trends make this risk unusually persistent: worsening rivalry among nuclear-armed states, erosion of arms-control agreements, cyber threats to command-and-warning systems, faster weapons that compress decision time, and the possibility that AI-enabled surveillance or decision support could increase false confidence during a crisis. Human error, technical malfunction, or a mistaken interpretation of an attack could be enough.
Even a “limited” exchange could cause global famine through nuclear winter, collapsing food systems and governments far from the battlefield. A full-scale exchange between major powers could destroy modern civilization and plausibly drive humanity to extinction through immediate devastation, radiation, infrastructure failure, disease, and years of climatic shock.