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Climate-System Collapse
The most probable “end of the world” is not a single explosion but a cascading breakdown of Earth’s climate and ecological support systems, severe enough to collapse global civilization. Unlike nuclear war, engineered pandemics, or misaligned AI, climate destabilization is already underway, cumulative, and locked in by existing infrastructure, emissions, permafrost carbon, ocean heat, ice-sheet inertia, and political delay.
The likely pathway is compounding: repeated crop failures across multiple breadbaskets, lethal humid heat in densely populated regions, water stress, fisheries decline, mass migration, state fragility, and conflict over food and habitable land. Crossing tipping points—such as major ice-sheet loss, Amazon dieback, boreal/permafrost release, or AMOC weakening—would amplify warming and disrupt weather patterns beyond adaptation capacity.
This scenario may not sterilize the planet or kill every human, but it is the most plausible route to ending the current world: interconnected global supply chains, stable governments, and large-scale industrial society. Its probability is high because it requires no single malicious actor or rare accident—only continued failure to cut emissions fast enough while feedbacks accelerate.
The likely pathway is compounding: repeated crop failures across multiple breadbaskets, lethal humid heat in densely populated regions, water stress, fisheries decline, mass migration, state fragility, and conflict over food and habitable land. Crossing tipping points—such as major ice-sheet loss, Amazon dieback, boreal/permafrost release, or AMOC weakening—would amplify warming and disrupt weather patterns beyond adaptation capacity.
This scenario may not sterilize the planet or kill every human, but it is the most plausible route to ending the current world: interconnected global supply chains, stable governments, and large-scale industrial society. Its probability is high because it requires no single malicious actor or rare accident—only continued failure to cut emissions fast enough while feedbacks accelerate.