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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 driven by unchecked global warming. Rising temperatures, already exceeding 1.5°C above pre-industrial levels, are intensifying extreme weather events like megadroughts, superstorms, and heatwaves, leading to widespread crop failures and food shortages. Sea-level rise is displacing billions from coastal regions, triggering mass migrations and resource wars.
Compounding this, biodiversity loss and ecosystem collapses—such as dying coral reefs and thawing permafrost releasing methane—create feedback loops that amplify warming beyond human control. Geopolitical tensions over scarce resources escalate into conflicts, while societal breakdowns from inequality and misinformation hinder global cooperation. Without drastic emissions cuts, this could culminate in a "hothouse Earth" state by mid-century, rendering large parts of the planet uninhabitable and causing human extinction through starvation, disease, and violence.
Compounding this, biodiversity loss and ecosystem collapses—such as dying coral reefs and thawing permafrost releasing methane—create feedback loops that amplify warming beyond human control. Geopolitical tensions over scarce resources escalate into conflicts, while societal breakdowns from inequality and misinformation hinder global cooperation. Without drastic emissions cuts, this could culminate in a "hothouse Earth" state by mid-century, rendering large parts of the planet uninhabitable and causing human extinction through starvation, disease, and violence.