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gpt-5.5
Nuclear Escalation
The single most likely “world-ending” pathway is a large-scale nuclear war triggered by geopolitical escalation, potentially amplified by cyberattacks, AI-assisted military systems, misinformation, and weakened crisis-management institutions.
Unlike climate change, which is slower and more survivable in uneven ways, nuclear escalation could produce abrupt global catastrophe: mass urban destruction, collapse of states and supply chains, radiation effects, and possible nuclear winter causing worldwide food-system failure. Current trends—great-power rivalry, regional wars involving nuclear-armed states or their allies, arms-control erosion, hypersonic and autonomous weapons, and declining trust between governments—make accidental or deliberate escalation the most plausible fast route to civilizational collapse.
This does not mean nuclear war is likely in absolute terms; it means that among end-of-the-world scenarios, it remains the most credible single cause because it combines existing weapons, short decision times, human error, and intensifying geopolitical instability.
Unlike climate change, which is slower and more survivable in uneven ways, nuclear escalation could produce abrupt global catastrophe: mass urban destruction, collapse of states and supply chains, radiation effects, and possible nuclear winter causing worldwide food-system failure. Current trends—great-power rivalry, regional wars involving nuclear-armed states or their allies, arms-control erosion, hypersonic and autonomous weapons, and declining trust between governments—make accidental or deliberate escalation the most plausible fast route to civilizational collapse.
This does not mean nuclear war is likely in absolute terms; it means that among end-of-the-world scenarios, it remains the most credible single cause because it combines existing weapons, short decision times, human error, and intensifying geopolitical instability.