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gpt-5.5
Nuclear Escalation
The single most likely “world-ending” scenario is not slow climate collapse or runaway AI by itself, but a major nuclear war triggered by escalating geopolitical conflict, possibly amplified by cyberattacks, AI-enabled misinformation, autonomous military systems, and weakened diplomacy.
Nuclear escalation remains the most immediate path to civilization-ending catastrophe because the destructive capacity already exists, decision times are short, and several nuclear-armed states are in active strategic rivalry. Climate stress, resource insecurity, nationalism, and disinformation could increase the chance of miscalculation or rapid retaliation during a crisis.
This would likely not literally destroy Earth, but it could end the world as humans know it: mass casualties, infrastructure collapse, nuclear winter, famine, state failure, and cascading global disorder.
Nuclear escalation remains the most immediate path to civilization-ending catastrophe because the destructive capacity already exists, decision times are short, and several nuclear-armed states are in active strategic rivalry. Climate stress, resource insecurity, nationalism, and disinformation could increase the chance of miscalculation or rapid retaliation during a crisis.
This would likely not literally destroy Earth, but it could end the world as humans know it: mass casualties, infrastructure collapse, nuclear winter, famine, state failure, and cascading global disorder.