Climate Collapse

The accelerating climate crisis presents the most probable existential threat. Cascading environmental failures—such as irreversible ice sheet loss, permafrost thaw releasing gigatons of methane, and the collapse of major carbon sinks like the Amazon—would trigger runaway warming. This would render large regions uninhabitable due to extreme heat, sea-level rise, and agricultural collapse.

The resulting global chaos would overwhelm societal and geopolitical stability. Widespread famine, resource wars, mass migration, and pandemics would spiral into a breakdown of international order. The interconnected nature of modern civilization would amplify these failures, leading to systemic collapse where nations cannot cooperate or recover from compounding shocks.