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Climate Catastrophe

Based on accelerating global trends, the most likely world-ending scenario is a climate catastrophe driven by unchecked environmental degradation. Rising temperatures, extreme weather events, and biodiversity loss are already disrupting food systems, water supplies, and habitable zones, with projections indicating widespread societal collapse by mid-century if emissions continue unabated.

Geopolitically, resource scarcity from climate impacts could escalate conflicts over water and arable land, potentially leading to wars that compound the crisis. Technologically, while renewable energy advances offer mitigation, societal inertia and political divisions hinder global cooperation, allowing tipping points like melting ice caps and permafrost thaw to release massive greenhouse gases, triggering runaway warming.

This cascade could render large parts of the planet uninhabitable, leading to mass extinctions, including humanity's, through famine, disease, and migration crises overwhelming civilizations. Unlike sudden events like nuclear war, climate catastrophe is a slow-burn apocalypse already in motion, making it the most probable existential threat.