About 250 million years ago, at the end of the Permian period, something killed some 90 percent of the planet's species. Less than 5 percent of the animal species in the seas survived. On land ...
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Carbon dioxide has been regulating Earth's climate for hundreds of millions of years—new studyThe Late Paleozoic ice age has long been a climate ... million years ago around the boundary between the Carboniferous and Permian periods. The low atmospheric CO₂ combined with less heat ...
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