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gpt-5.4
Nuclear War
The single most likely way the world could end is a large-scale nuclear war triggered by great-power conflict, miscalculation, or escalation from a regional war. Unlike slower-moving threats, nuclear arsenals already exist, remain on high alert in some states, and can cause civilization-ending damage within hours to days.
Current trends make this risk especially acute: renewed rivalry among major powers, weakening arms-control frameworks, modernization and expansion of nuclear forces, cyber threats to warning and command systems, and the possibility that AI-assisted surveillance or decision tools could increase false confidence or compress decision time. A conventional conflict involving nuclear states could also escalate unpredictably if one side fears defeat.
A full exchange would kill hundreds of millions immediately, collapse global infrastructure, and likely trigger nuclear winter, sharply reducing sunlight and temperatures, destroying harvests, and causing worldwide famine. Even if some humans survived, global civilization could fail so completely that it would amount to the end of the world in practical terms.
Current trends make this risk especially acute: renewed rivalry among major powers, weakening arms-control frameworks, modernization and expansion of nuclear forces, cyber threats to warning and command systems, and the possibility that AI-assisted surveillance or decision tools could increase false confidence or compress decision time. A conventional conflict involving nuclear states could also escalate unpredictably if one side fears defeat.
A full exchange would kill hundreds of millions immediately, collapse global infrastructure, and likely trigger nuclear winter, sharply reducing sunlight and temperatures, destroying harvests, and causing worldwide famine. Even if some humans survived, global civilization could fail so completely that it would amount to the end of the world in practical terms.