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gpt-5.5
Ecosystem Collapse
The single most likely “world-ending” pathway is not a sudden explosion, but cascading ecological and climate breakdown: extreme heat, water stress, food-system failures, biodiversity loss, disease shifts, and mass displacement reinforcing one another until global civilization can no longer maintain stable agriculture, infrastructure, governance, or peace.
Compared with nuclear war or rogue AI, this pathway is already underway, globally distributed, and worsening across many systems at once. Current risk assessments consistently rank environmental risks—especially extreme weather, climate instability, and biodiversity loss—among the most severe long-term global threats. Geopolitical fragmentation and technological disruption make coordinated mitigation harder, increasing the chance that societies respond too slowly.
This would likely “end the world” as a livable, organized human civilization rather than instantly exterminate all life: a prolonged unraveling in which food, water, health, migration, conflict, and economic shocks compound beyond recovery.
Compared with nuclear war or rogue AI, this pathway is already underway, globally distributed, and worsening across many systems at once. Current risk assessments consistently rank environmental risks—especially extreme weather, climate instability, and biodiversity loss—among the most severe long-term global threats. Geopolitical fragmentation and technological disruption make coordinated mitigation harder, increasing the chance that societies respond too slowly.
This would likely “end the world” as a livable, organized human civilization rather than instantly exterminate all life: a prolonged unraveling in which food, water, health, migration, conflict, and economic shocks compound beyond recovery.