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Climate-Driven Civilizational Collapse
The most probable "end of the world" is not a single dramatic event but the gradual breakdown of organized global civilization driven by climate change. Current policies put Earth on track for roughly 2.5–3°C of warming by 2100, a level at which multiple tipping points—Greenland and West Antarctic ice loss, permafrost thaw, Amazon dieback, and weakening of the Atlantic Meridional Overturning Circulation—risk becoming self-sustaining and irreversible.
The lethal mechanism is cascading system failure rather than heat alone. Unpredictable rainfall and extreme weather undermine harvests across multiple breadbaskets simultaneously; sea-level rise and chronic water scarcity displace hundreds of millions; these shocks strain already fragile supply chains, economies, and governments. Food insecurity and mass migration historically fuel state collapse and conflict—including between nuclear-armed states—so climate change acts as a threat multiplier that amplifies every other major risk.
Unlike asteroids or supervolcanoes, this trajectory is already in motion and empirically measurable. Unlike engineered pandemics or misaligned AI, it requires no novel technology or accident—only the continuation of present trends. Complete human extinction remains unlikely, as our species is adaptable and geographically dispersed. But "the world" as an interconnected civilization of stable states, global trade, and relative prosperity is far more fragile. On current trends, its slow unraveling over the coming century is the single most probable way the world as we know it ends.
The lethal mechanism is cascading system failure rather than heat alone. Unpredictable rainfall and extreme weather undermine harvests across multiple breadbaskets simultaneously; sea-level rise and chronic water scarcity displace hundreds of millions; these shocks strain already fragile supply chains, economies, and governments. Food insecurity and mass migration historically fuel state collapse and conflict—including between nuclear-armed states—so climate change acts as a threat multiplier that amplifies every other major risk.
Unlike asteroids or supervolcanoes, this trajectory is already in motion and empirically measurable. Unlike engineered pandemics or misaligned AI, it requires no novel technology or accident—only the continuation of present trends. Complete human extinction remains unlikely, as our species is adaptable and geographically dispersed. But "the world" as an interconnected civilization of stable states, global trade, and relative prosperity is far more fragile. On current trends, its slow unraveling over the coming century is the single most probable way the world as we know it ends.