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Nuclear Escalation
The most likely world-ending path is a rapid nuclear exchange triggered by a regional war between nuclear-armed states or their proxies. Active flashpoints, weakened arms-control regimes, hypersonic delivery systems, cyberattacks on early-warning networks, and AI-compressed decision timelines increase the chance that a limited strike is misread as an existential attack, forcing launch-on-warning retaliation.
Unlike climate collapse, which is severe but slower, or misaligned AI, which is plausible but still uncertain, nuclear weapons already exist in sufficient numbers to destroy modern civilization within hours. Even a “limited” war could cause firestorms, radioactive fallout, nuclear winter, crop failure, famine, and breakdown of supply chains; full escalation could make large parts of the planet uninhabitable and end organized human society.
Unlike climate collapse, which is severe but slower, or misaligned AI, which is plausible but still uncertain, nuclear weapons already exist in sufficient numbers to destroy modern civilization within hours. Even a “limited” war could cause firestorms, radioactive fallout, nuclear winter, crop failure, famine, and breakdown of supply chains; full escalation could make large parts of the planet uninhabitable and end organized human society.