Nuclear War Escalation

The most likely single path to a rapid, global “end of the world” scenario is a large-scale nuclear conflict triggered by escalation among nuclear-armed states during a conventional war or major crisis. Current trends—intensifying great-power rivalry, persistent regional flashpoints, misinformation and compressed decision timelines, cyber interference in command-and-control, and the growing integration of AI into surveillance and military decision support—raise the probability of miscalculation, false alarms, or unintended escalation.

Unlike slower-moving existential risks, nuclear war can unfold in hours. Even a “limited” exchange could prompt further retaliation, collapse critical infrastructure, and disrupt global trade and governance. A full-scale exchange would likely cause mass casualties and long-term global disruption via nuclear winter effects (sunlight reduction, crop failures), making sustained civilization-level breakdown plausible.