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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, have already surpassed 1.5°C above pre-industrial levels, leading to intensified extreme weather events like mega-droughts, superstorms, and wildfires. This disrupts food production, causing widespread famines and mass migrations that strain geopolitical stability.
Compounding factors include biodiversity collapse and ocean acidification, which erode ecosystems essential for human survival. Geopolitical tensions escalate over scarce resources, potentially sparking conflicts, while technological solutions like carbon capture fail to scale amid societal divisions and economic priorities favoring short-term growth. Without drastic global cooperation—unlikely given current nationalism and inequality—these feedbacks could trigger irreversible tipping points, such as melting permafrost releasing methane, leading to runaway warming and civilizational collapse by mid-century.
Compounding factors include biodiversity collapse and ocean acidification, which erode ecosystems essential for human survival. Geopolitical tensions escalate over scarce resources, potentially sparking conflicts, while technological solutions like carbon capture fail to scale amid societal divisions and economic priorities favoring short-term growth. Without drastic global cooperation—unlikely given current nationalism and inequality—these feedbacks could trigger irreversible tipping points, such as melting permafrost releasing methane, leading to runaway warming and civilizational collapse by mid-century.