Nuclear Escalation

Based on converging trends in geopolitics and society, the most probable existential threat is uncontrolled escalation of a regional conflict into global thermonuclear war. Intensifying great power rivalry, particularly between nuclear-armed states like the US, Russia, and China, creates flashpoints (e.g., Ukraine, Taiwan) vulnerable to miscalculation or deliberate brinkmanship. Societal polarization and the erosion of international norms undermine crisis communication and arms control.

Simultaneously, the proliferation of advanced conventional weapons and emerging technologies (cyber, AI-enabled targeting) lowers the threshold for conflict initiation and increases the risk of rapid, uncontrollable escalation. A localized crisis could spiral into strategic nuclear exchange through misperception, automated systems, or desperate leadership decisions under pressure. The resulting nuclear winter would cause catastrophic climate disruption, widespread famine, and societal collapse, rendering large parts of the planet uninhabitable.