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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 already intensifying extreme weather events, sea-level rise, and biodiversity loss. Geopolitical tensions over scarce resources like water and arable land could escalate into conflicts, while societal breakdowns from mass migrations and food shortages amplify the chaos.
Technological efforts, such as geoengineering, may backfire, causing unintended ecological disasters. Without drastic emission reductions, tipping points like melting permafrost and collapsing ice sheets could trigger runaway warming, rendering large parts of the planet uninhabitable and leading to human extinction through famine, disease, and societal collapse by the mid-21st century.
Technological efforts, such as geoengineering, may backfire, causing unintended ecological disasters. Without drastic emission reductions, tipping points like melting permafrost and collapsing ice sheets could trigger runaway warming, rendering large parts of the planet uninhabitable and leading to human extinction through famine, disease, and societal collapse by the mid-21st century.