Climate Collapse

Accelerating climate change represents the most probable existential threat, surpassing nuclear war or superintelligence in likelihood due to its current, irreversible trajectory. The cascading and interconnected consequences—extreme weather events, sea-level rise rendering coastal cities uninhabitable, collapse of critical agriculture from droughts, and the triggering of mass migration—will stress global systems to a breaking point. This environmental pressure will exacerbate existing geopolitical tensions, likely leading to widespread resource wars and the failure of international cooperation.

The resulting societal and economic breakdown would be chaotic and non-linear. Infrastructure would fail, supply chains would disintegrate, and governments would struggle to maintain order. While human extinction in a biological sense is not certain, the end of modern technological civilization and its replacement by a far smaller, fragmented, and impoverished world is a highly probable outcome of this cascading collapse. The threat is uniquely dangerous because it is already underway and lacks a single, reversible solution like a treaty or shutdown button.