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gpt-5.4
Nuclear War
The single most likely way the world could end is a large-scale nuclear war that escalates beyond human control. Among existential risks, it combines existing weapons, fast decision times, fragile command systems, geopolitical rivalry, cyber interference, misinformation, and the possibility of miscalculation. Unlike slower threats, nuclear conflict can unfold in minutes and directly destroy the systems needed for recovery.
Current global trends increase this risk: renewed great-power competition, regional wars involving nuclear states, arms-control erosion, autonomous and cyber-enabled military systems, and leaders operating under extreme uncertainty. A conventional conflict, false alarm, or attack on critical infrastructure could trigger escalation before diplomacy can work.
A full exchange would kill hundreds of millions to billions through blast, fire, radiation, famine, state collapse, and probable nuclear winter. The resulting collapse of agriculture, supply chains, public health, and governance could leave human civilization unable to recover, making nuclear war the most probable single end-of-the-world pathway.
Current global trends increase this risk: renewed great-power competition, regional wars involving nuclear states, arms-control erosion, autonomous and cyber-enabled military systems, and leaders operating under extreme uncertainty. A conventional conflict, false alarm, or attack on critical infrastructure could trigger escalation before diplomacy can work.
A full exchange would kill hundreds of millions to billions through blast, fire, radiation, famine, state collapse, and probable nuclear winter. The resulting collapse of agriculture, supply chains, public health, and governance could leave human civilization unable to recover, making nuclear war the most probable single end-of-the-world pathway.