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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 greenhouse gas emissions, deforestation, and biodiversity loss. Rising temperatures have already intensified extreme weather events, including megadroughts, superstorms, and heatwaves, leading to widespread crop failures and mass migrations.
Geopolitically, resource scarcity exacerbates conflicts over water and arable land, potentially sparking wars that further degrade the environment. Technological efforts like carbon capture lag behind, while societal denial and inequality hinder global cooperation. This feedback loop could push Earth past tipping points, such as melting permafrost releasing methane or collapsing ice sheets causing rapid sea-level rise, rendering large swaths of the planet uninhabitable.
Ultimately, this would lead to societal collapse, famine, and human extinction-level events, outpacing other risks like AI misalignment or nuclear war due to its inevitability without drastic intervention.
Geopolitically, resource scarcity exacerbates conflicts over water and arable land, potentially sparking wars that further degrade the environment. Technological efforts like carbon capture lag behind, while societal denial and inequality hinder global cooperation. This feedback loop could push Earth past tipping points, such as melting permafrost releasing methane or collapsing ice sheets causing rapid sea-level rise, rendering large swaths of the planet uninhabitable.
Ultimately, this would lead to societal collapse, famine, and human extinction-level events, outpacing other risks like AI misalignment or nuclear war due to its inevitability without drastic intervention.