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gpt-5.5
Nuclear Escalation
The single most likely world-ending pathway is a major nuclear war triggered by escalating geopolitical conflict, miscalculation, or automated decision-making under crisis pressure.
Unlike climate change, which is catastrophic but slower and uneven, nuclear escalation can destroy global civilization within hours and create longer-term collapse through firestorms, radioactive fallout, infrastructure failure, food-system breakdown, and possible nuclear winter. Current trends make this risk especially dangerous: renewed great-power rivalry, weakened arms-control regimes, regional flashpoints, cyber threats to command systems, and the growing role of AI in surveillance, targeting, and military decision support.
The most plausible scenario is not a deliberate plan to “end the world,” but a fast-moving crisis where leaders believe they must act before losing deterrent capability. A limited strike could trigger retaliation, then wider escalation, leaving no stable stopping point.
Unlike climate change, which is catastrophic but slower and uneven, nuclear escalation can destroy global civilization within hours and create longer-term collapse through firestorms, radioactive fallout, infrastructure failure, food-system breakdown, and possible nuclear winter. Current trends make this risk especially dangerous: renewed great-power rivalry, weakened arms-control regimes, regional flashpoints, cyber threats to command systems, and the growing role of AI in surveillance, targeting, and military decision support.
The most plausible scenario is not a deliberate plan to “end the world,” but a fast-moving crisis where leaders believe they must act before losing deterrent capability. A limited strike could trigger retaliation, then wider escalation, leaving no stable stopping point.