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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, driven by unchecked greenhouse gas emissions, are projected to exceed 3°C by 2100, triggering irreversible tipping points like melting permafrost, collapsing ice sheets, and disrupted ocean currents.
This would lead to widespread crop failures, mass migrations, and resource wars, exacerbated by geopolitical tensions over water and arable land. Technological efforts like carbon capture fall short without global cooperation, while societal denial and inequality hinder mitigation. Ultimately, ecosystem collapse and uninhabitable regions could cause human civilization's downfall, potentially leading to extinction-level events through famine, disease, and conflict.
This would lead to widespread crop failures, mass migrations, and resource wars, exacerbated by geopolitical tensions over water and arable land. Technological efforts like carbon capture fall short without global cooperation, while societal denial and inequality hinder mitigation. Ultimately, ecosystem collapse and uninhabitable regions could cause human civilization's downfall, potentially leading to extinction-level events through famine, disease, and conflict.