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Mass extinction's cause: 'Sick Earth'

10-20-2006 · EurekAlert!

The Permian-Triassic extinction is the largest recorded, more disastrous for life forms than the extinction that killed the dinosaurs. Its cause continues to be debated. USC earth scientists say their latest research points to gradual deterioration in the environment due in part to ocean warming.

Keywords: mass, extinction, cause, sick, earth

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