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Nuclear War
Armed with over 12,000 warheads, nine nuclear states maintain escalating tensions amid eroding arms control treaties, proxy conflicts, and rapid technological advancements in delivery systems. Geopolitical instability—exacerbated by resource scarcity, climate-induced migration, and great-power rivalry—creates multiple pathways to miscalculation.
A large-scale exchange, even between regional powers, could trigger "nuclear winter" via soot lofted into the stratosphere, collapsing agriculture globally. Secondary effects—electromagnetic pulses disabling critical infrastructure, societal breakdown, and failed states—would compound devastation. Unlike slower threats (e.g., climate change), nuclear war offers no recovery window; once triggered, cascading failures could render Earth uninhabitable within months. Historical near-misses (e.g., 1983, 1995) underscore systemic fragility. While AI or bioweapons pose long-term risks, no other threat combines current technological immediacy, geopolitical volatility, and irreversible consequences.
A large-scale exchange, even between regional powers, could trigger "nuclear winter" via soot lofted into the stratosphere, collapsing agriculture globally. Secondary effects—electromagnetic pulses disabling critical infrastructure, societal breakdown, and failed states—would compound devastation. Unlike slower threats (e.g., climate change), nuclear war offers no recovery window; once triggered, cascading failures could render Earth uninhabitable within months. Historical near-misses (e.g., 1983, 1995) underscore systemic fragility. While AI or bioweapons pose long-term risks, no other threat combines current technological immediacy, geopolitical volatility, and irreversible consequences.