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gpt-5.5
Cascading Climate Collapse
The single most likely “end of the world” scenario is not a sudden asteroid-like event, but a cascading climate-driven collapse of global civilization: extreme heat, food and water shocks, ecosystem breakdown, mass migration, economic instability, and escalating conflict reinforcing one another until modern systems can no longer recover.
Climate change is already a persistent, global, compounding risk, and unlike nuclear war or rogue AI, it does not require one discrete trigger or decision. It steadily increases pressure on agriculture, coastlines, health systems, energy grids, insurance markets, and governments. As biodiversity loss and freshwater stress worsen, the buffers that make civilization resilient weaken.
This would probably not mean instant human extinction. The more likely “world ends” pathway is the end of the world as a stable, interconnected, technological civilization: fragmented states, chronic famine zones, resource wars, authoritarian emergency politics, and irreversible ecological damage. Other risks may accelerate it, but climate-driven systemic collapse is the most probable root cause.
Climate change is already a persistent, global, compounding risk, and unlike nuclear war or rogue AI, it does not require one discrete trigger or decision. It steadily increases pressure on agriculture, coastlines, health systems, energy grids, insurance markets, and governments. As biodiversity loss and freshwater stress worsen, the buffers that make civilization resilient weaken.
This would probably not mean instant human extinction. The more likely “world ends” pathway is the end of the world as a stable, interconnected, technological civilization: fragmented states, chronic famine zones, resource wars, authoritarian emergency politics, and irreversible ecological damage. Other risks may accelerate it, but climate-driven systemic collapse is the most probable root cause.