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Climate Catastrophe
Based on accelerating global trends, the most likely world-ending scenario is a cascading climate catastrophe driven by unchecked environmental degradation. Rising temperatures, fueled by greenhouse gas emissions, are projected to exceed 2-3°C by mid-century, triggering irreversible tipping points like polar ice melt, permafrost thaw, and Amazon dieback. This would amplify extreme weather events, including megadroughts, superstorms, and heatwaves, leading to widespread crop failures, mass migrations, and resource wars.
Geopolitically, competition over dwindling water and arable land could escalate conflicts, while societal breakdowns from inequality and displacement strain global systems. Technologically, failed mitigation efforts—such as inadequate renewable transitions or geoengineering mishaps—would compound the crisis, potentially causing billions of deaths through famine, disease, and violence, culminating in human civilization's collapse by 2100 or sooner if emissions aren't curtailed immediately.
Geopolitically, competition over dwindling water and arable land could escalate conflicts, while societal breakdowns from inequality and displacement strain global systems. Technologically, failed mitigation efforts—such as inadequate renewable transitions or geoengineering mishaps—would compound the crisis, potentially causing billions of deaths through famine, disease, and violence, culminating in human civilization's collapse by 2100 or sooner if emissions aren't curtailed immediately.