Nuclear Escalation

The most probable path to global catastrophe is a nuclear war triggered by geopolitical escalation. Rising tensions among nuclear-armed states, erosion of arms-control agreements, regional conflicts, and increasing reliance on nuclear deterrence raise the risk of miscalculation.

Advances in hypersonic weapons, cyber warfare, artificial intelligence, and missile defense systems could compress decision-making time and increase the chance of accidental or preemptive strikes. Environmental stress, resource competition, and political instability may further intensify international crises.

While climate change and ecological collapse pose severe long-term threats, they are less likely to cause sudden global termination than nuclear conflict. A large-scale nuclear exchange would produce immediate mass casualties, firestorms, radiation fallout, and nuclear winter, potentially collapsing agriculture, ecosystems, and modern civilization worldwide.