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Climate Catastrophe
Based on accelerating global trends as of 2026, the most likely world-ending scenario is a cascading climate catastrophe. Rising temperatures, extreme weather events, and ecosystem breakdowns—exacerbated by insufficient international mitigation efforts—could trigger irreversible tipping points like methane release from permafrost and collapse of major ice sheets.
This would lead to widespread famine, mass migrations, and societal collapse, potentially culminating in human extinction through uninhabitable regions, resource wars, and secondary effects like pandemics from disrupted habitats. Geopolitical tensions over scarce resources might accelerate this, but climate remains the root driver, outpacing technological or other risks in probability.
This would lead to widespread famine, mass migrations, and societal collapse, potentially culminating in human extinction through uninhabitable regions, resource wars, and secondary effects like pandemics from disrupted habitats. Geopolitical tensions over scarce resources might accelerate this, but climate remains the root driver, outpacing technological or other risks in probability.