Nuclear Escalation from Climate-Driven Conflict

The most likely pathway to global catastrophe originates in the accelerating climate crisis. As extreme weather events intensify, causing widespread crop failure, fresh water scarcity, and large-scale human migration, existing geopolitical tensions will be severely exacerbated. Nations will enter destabilizing competition for dwindling resources and habitable land. This pressure cooker environment, combined with pre-existing alliances and nuclear arsenals, creates fertile ground for regional conflicts to spiral beyond control.

These climate-driven resource wars, intertwined with great-power competition, make the deliberate or accidental use of nuclear weapons the single most probable scenario for causing irreversible global civilizational collapse. The threshold for nuclear use could lower as states perceive existential threats from resource loss or internal collapse, leading to a chain reaction of escalation that cannot be contained.