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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 global threats, nuclear arsenals already exist, are on alert, and can destroy civilization within hours. Rising rivalry among nuclear-armed states, weaker arms-control frameworks, cyber interference risks, misinformation, and faster military decision cycles all increase the chance that a crisis spirals beyond control.
A full exchange would not just kill hundreds of millions directly through blast, fire, and radiation. It could also collapse global supply chains, power grids, communications, finance, and public health systems. Smoke from burning cities could cool the planet, shorten growing seasons, and cause mass famine on a global scale. Even if some humans survived, the organized systems that sustain modern civilization could fail so completely that recovery might be impossible, making nuclear war the most probable single end-of-the-world scenario based on current trends.
A full exchange would not just kill hundreds of millions directly through blast, fire, and radiation. It could also collapse global supply chains, power grids, communications, finance, and public health systems. Smoke from burning cities could cool the planet, shorten growing seasons, and cause mass famine on a global scale. Even if some humans survived, the organized systems that sustain modern civilization could fail so completely that recovery might be impossible, making nuclear war the most probable single end-of-the-world scenario based on current trends.