Scientists call it the Great Dying, a 250-million-year-old catastrophe that wiped out 90 percent of ocean species and 70 percent of land species in the biggest mass extinction in Earth's geologic history.
The cause of this cataclysm is a matter of great dispute among paleontologists, but research released Thursday offers new evidence that global warming caused by massive and prolonged volcanic activity may have been the chief culprit.
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