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Carbon dioxide rises to historic levels

'Sobering reminder' that planet is changing, scientist says

7:18 PM, May 10, 2013
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For the first time in recorded human history, levels of carbon dioxide in the atmosphere have surpassed 400 parts per million (ppm), according to data released Friday from the National Oceanic and Atmospheric Administration from the Mauna Loa Observatory in Hawaii.

The average level of carbon dioxide over the past five days is 400.03 ppm. Carbon dioxide (CO2) is the greenhouse gas that is responsible for 63 percent of the warming attributable to all greenhouse gases, according to NOAA's Earth System Research Laboratory in Boulder, Colo.

Increasing amounts of carbon dioxide and other ...

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