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Climate Catastrophe
Based on accelerating global trends as of 2026, the most probable world-ending scenario is a cascading climate catastrophe. Rising temperatures, extreme weather events, and ecosystem collapses—exacerbated by insufficient international cooperation and geopolitical conflicts over resources—could lead to widespread famine, mass migrations, and societal breakdowns by mid-century.
Technological advancements in renewables offer some mitigation, but entrenched fossil fuel dependencies and environmental tipping points (e.g., melting permafrost releasing methane) make irreversible damage likely. This could culminate in a "hothouse Earth" state, rendering large parts of the planet uninhabitable and triggering global civilization collapse without direct human extinction.
Technological advancements in renewables offer some mitigation, but entrenched fossil fuel dependencies and environmental tipping points (e.g., melting permafrost releasing methane) make irreversible damage likely. This could culminate in a "hothouse Earth" state, rendering large parts of the planet uninhabitable and triggering global civilization collapse without direct human extinction.