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Nuclear War
The single most probable cause of global catastrophe is a large-scale nuclear exchange between major powers, most plausibly triggered by escalation of a regional conflict—such as Russia–NATO tensions in Eastern Europe, a China–Taiwan confrontation, or an India–Pakistan crisis—compounded by miscalculation, false alarms, or loss of control over increasingly automated command systems.
Current trends support this assessment: arms control treaties have collapsed or been suspended, arsenals are being modernized and expanded (including by China, Russia, and the United States), hypersonic weapons and AI-assisted early-warning systems compress decision times to minutes, and more states are pursuing or considering nuclear weapons. Meanwhile, great-power distrust is at its highest level since the Cold War, and cyberattacks on early-warning infrastructure raise the risk of accidental launches.
Even a "limited" regional exchange—say, 100 Hiroshima-sized weapons—could inject enough soot into the stratosphere to trigger a nuclear winter, collapsing global agriculture for a decade and causing famine for billions. A full US–Russia exchange would likely end industrial civilization outright, with most of humanity dying from starvation, cold, and societal breakdown within years.
Unlike climate change, which is severe but unfolds over decades and permits adaptation, nuclear war combines high and rising probability with the capacity to destroy civilization in a single afternoon—making it the most likely way the world as we know it could end.
Current trends support this assessment: arms control treaties have collapsed or been suspended, arsenals are being modernized and expanded (including by China, Russia, and the United States), hypersonic weapons and AI-assisted early-warning systems compress decision times to minutes, and more states are pursuing or considering nuclear weapons. Meanwhile, great-power distrust is at its highest level since the Cold War, and cyberattacks on early-warning infrastructure raise the risk of accidental launches.
Even a "limited" regional exchange—say, 100 Hiroshima-sized weapons—could inject enough soot into the stratosphere to trigger a nuclear winter, collapsing global agriculture for a decade and causing famine for billions. A full US–Russia exchange would likely end industrial civilization outright, with most of humanity dying from starvation, cold, and societal breakdown within years.
Unlike climate change, which is severe but unfolds over decades and permits adaptation, nuclear war combines high and rising probability with the capacity to destroy civilization in a single afternoon—making it the most likely way the world as we know it could end.