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Current Event May 22, 2015

A Dramatic Climate Change Discovery

Greenhouse gas emissions in March were some of the highest ever recorded on the planet in millions of years. Carbon dioxide emissions have built up over time and increased the saturation of carbon dioxide in the atmosphere up to 400 parts per million. Listen to learn about how scientists are able to determine past levels of carbon dioxide and measure this current trend.

Climate Change Earth and Space Science

Story Length: 4:30

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National Public Radio © 2015 National Public Radio, Inc. Used with the permission of NPR. All rights reserved.

AIR DATE: 05/08/2015

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