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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 environmental degradation. Rising temperatures, extreme weather events, and ecosystem collapses—exacerbated by deforestation, biodiversity loss, and fossil fuel dependency—could trigger irreversible tipping points like melting permafrost releasing methane or collapsing ice sheets causing massive sea-level rise.
This would lead to widespread famine, mass migrations, and societal breakdowns as arable land diminishes, water scarcity intensifies, and coastal cities flood. Geopolitical tensions over resources could escalate into conflicts, but the root cause remains environmental. Technological and societal adaptations are lagging behind the pace of change, making this the predominant existential threat without drastic, unified global action.
This would lead to widespread famine, mass migrations, and societal breakdowns as arable land diminishes, water scarcity intensifies, and coastal cities flood. Geopolitical tensions over resources could escalate into conflicts, but the root cause remains environmental. Technological and societal adaptations are lagging behind the pace of change, making this the predominant existential threat without drastic, unified global action.