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Climate-Driven Collapse
Current trajectories in greenhouse gas emissions, biodiversity loss, and resource overuse point to cascading environmental failures as the most probable path to civilizational end. Atmospheric CO2 has reached record highs, global temperatures continue setting annual records, and multiple Earth system tipping points—such as ice sheet melt, Amazon dieback, and permafrost thaw—are approaching or crossing thresholds.[[1]](https://thebulletin.org/doomsday-clock/2026-statement/)
These changes intensify extreme weather, disrupt food and water systems, drive mass migration, and amplify geopolitical conflicts over dwindling resources. Combined with societal polarization, inequality, and weakened international cooperation, the result is progressive state fragility and systemic breakdown rather than a single dramatic event. Long-term risk assessments consistently rank extreme weather, biodiversity collapse, and critical Earth system changes among the highest-severity threats over the coming decade.[[2]](https://reports.weforum.org/docs/WEF_Global_Risks_Report_2026.pdf)
Unlike lower-probability sudden risks such as full-scale nuclear exchange or uncontrolled AI, climate impacts are already locked in and compounding under existing policies, making widespread societal unraveling the single most likely outcome.
These changes intensify extreme weather, disrupt food and water systems, drive mass migration, and amplify geopolitical conflicts over dwindling resources. Combined with societal polarization, inequality, and weakened international cooperation, the result is progressive state fragility and systemic breakdown rather than a single dramatic event. Long-term risk assessments consistently rank extreme weather, biodiversity collapse, and critical Earth system changes among the highest-severity threats over the coming decade.[[2]](https://reports.weforum.org/docs/WEF_Global_Risks_Report_2026.pdf)
Unlike lower-probability sudden risks such as full-scale nuclear exchange or uncontrolled AI, climate impacts are already locked in and compounding under existing policies, making widespread societal unraveling the single most likely outcome.