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Escalatory Nuclear War
The most plausible near-term “world-ending” pathway is not a single deliberate apocalypse but a cascade: regional conflict, misread signals, cyber or satellite interference, automated early-warning pressure, and failing arms-control norms push one nuclear exchange into many. Unlike climate change, which is severe but slower, nuclear war can collapse civilization within weeks through blast, firestorms, fallout, infrastructure loss, and especially nuclear winter—soot-driven cooling that disrupts global agriculture for years.
Current trends raise the risk: renewed great-power rivalry, hypersonic and dual-capable weapons, smaller tactical warheads, degraded treaties, compressed decision times, and AI-assisted command systems that can amplify false alarms. Even a “limited” exchange could trigger famine, state failure, mass migration, and secondary wars. The likely end state is not instant human extinction, but a rapid breakdown of food, energy, health, and governance systems that modern civilization cannot survive.
Current trends raise the risk: renewed great-power rivalry, hypersonic and dual-capable weapons, smaller tactical warheads, degraded treaties, compressed decision times, and AI-assisted command systems that can amplify false alarms. Even a “limited” exchange could trigger famine, state failure, mass migration, and secondary wars. The likely end state is not instant human extinction, but a rapid breakdown of food, energy, health, and governance systems that modern civilization cannot survive.