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Nuclear Miscalculation
The most probable near-term “end of the world” scenario is not literal planetary destruction, but a rapid collapse of modern civilization through nuclear escalation between major powers. The core risk is a regional crisis—Russia-NATO, China-Taiwan, India-Pakistan, or the Korean Peninsula—spiraling through miscalculation, cyber interference, false alerts, or a conventional strike mistaken for a nuclear one.
Current trends make this more likely: arms-control regimes have weakened, arsenals are being modernized, hypersonic missiles and autonomous early-warning systems compress decision time, and leaders face pressure to escalate before losing capability. Even a “limited” exchange could trigger firestorms, nuclear winter, crop failure, supply-chain collapse, and mass famine within months.
Climate change and AI are serious threat multipliers, but they are more likely to intensify conflict than directly end civilization quickly. Nuclear war is the one existing danger that can combine speed, scale, and irreversibility: a few days of escalation could kill hundreds of millions outright and undermine the ecological and industrial systems needed for recovery.
Current trends make this more likely: arms-control regimes have weakened, arsenals are being modernized, hypersonic missiles and autonomous early-warning systems compress decision time, and leaders face pressure to escalate before losing capability. Even a “limited” exchange could trigger firestorms, nuclear winter, crop failure, supply-chain collapse, and mass famine within months.
Climate change and AI are serious threat multipliers, but they are more likely to intensify conflict than directly end civilization quickly. Nuclear war is the one existing danger that can combine speed, scale, and irreversibility: a few days of escalation could kill hundreds of millions outright and undermine the ecological and industrial systems needed for recovery.