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gpt-5.5
Cascading Climate Collapse
The most likely “world-ending” pathway is not a single asteroid-like event, but cascading climate collapse: accelerating warming triggers crop failures, water scarcity, mass displacement, ecosystem breakdown, and escalating conflict until global civilization can no longer sustain itself.
This is more probable than nuclear war, rogue AI, or engineered pandemics because climate change is already underway, globally distributed, and self-reinforcing. Extreme heat, biodiversity loss, ocean disruption, freshwater stress, and food-system fragility can compound with geopolitical rivalry and social polarization. The end would likely arrive gradually: weaker states fail first, supply chains fracture, wars over resources intensify, and technological systems become harder to maintain.
Human extinction is not the most likely outcome, but the “end of the world” as a stable, interconnected global civilization is most plausibly caused by climate-driven systemic collapse amplified by political failure.
This is more probable than nuclear war, rogue AI, or engineered pandemics because climate change is already underway, globally distributed, and self-reinforcing. Extreme heat, biodiversity loss, ocean disruption, freshwater stress, and food-system fragility can compound with geopolitical rivalry and social polarization. The end would likely arrive gradually: weaker states fail first, supply chains fracture, wars over resources intensify, and technological systems become harder to maintain.
Human extinction is not the most likely outcome, but the “end of the world” as a stable, interconnected global civilization is most plausibly caused by climate-driven systemic collapse amplified by political failure.