Land plants saved the Earth from a deep frozen fate

Fifty million years ago, the North and South Poles were ice-free and crocodiles roamed the Arctic. Since then, a long-term decrease in the amount of CO2 in the atmosphere has cooled the Earth. Now researchers at Yale University, the Carnegie Institution of Washington and the University of Sheffield, writing in the current issue (2 July) of Nature, show that land plants saved the Earth from a deep frozen fate by buffering the removal of atmospheric CO2 over the past 24 million years...

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