Climate 420 Million Years Ago Poised for Comeback

SCIENTIFIC AMERICAN

Starting in the next century, atmospheric carbon levels could begin to approach those of hundreds of millions of years ago, and have their warming effect augmented by a brighter sun. 

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If society does not take steps to reduce greenhouse gas emissions, researchers say we could be on track to experience levels of atmospheric carbon dioxide not seen for at least 200 million years. (Credit: USGS)
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