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Cretaceous-Paleogene Extinction (66 million years ago)
The Cretaceous-Paleogene Extinction, sparked by the Chicxulub asteroid impact, ended the reign of non-avian dinosaurs and wiped out 76% of all species. It plunged the planet into years of nuclear winter that collapsed food chains globally, making it 24% less destructive than the Permian-Triassic Extinction in overall species loss.
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