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Naked Science: Extinctions

The Gorgonopsians died out in the greatest mass extinction the earth has ever know —at the end of the Permian period, when 95% of life on Earth vanished.
NGC examines three mass extinctions on Earth to see what caused them and if they could happen again. Would humans fare any better than the victims of these previous disasters? Worse, are we now in the middle of a mass extinction we brought on ourselves?