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Climate Collapse
The most probable existential threat is a cascading climate collapse. While geopolitical conflicts or technological risks like misaligned AI are significant, climate change presents a uniquely persistent and accelerating crisis. Current trends show global temperatures rising beyond 1.5°C targets, triggering irreversible tipping points like Arctic permafrost thaw and Amazon dieback. These processes release vast greenhouse gases, accelerating warming beyond human control.
This collapse would not be a single event but a cascade of systemic failures. Crop failures from extreme weather and drought would trigger global food crises and mass displacement. Freshwater scarcity, intensified storms, and sea-level rise would cripple infrastructure, economies, and supply chains. As nations prioritize survival, international cooperation would fracture, leading to resource conflicts and a breakdown in the global order necessary to address any transnational crisis. The resulting societal and ecosystem collapse would render the planet largely uninhabitable for complex civilizations within this century.
This collapse would not be a single event but a cascade of systemic failures. Crop failures from extreme weather and drought would trigger global food crises and mass displacement. Freshwater scarcity, intensified storms, and sea-level rise would cripple infrastructure, economies, and supply chains. As nations prioritize survival, international cooperation would fracture, leading to resource conflicts and a breakdown in the global order necessary to address any transnational crisis. The resulting societal and ecosystem collapse would render the planet largely uninhabitable for complex civilizations within this century.