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Scientists alarmed as CO2 passes threshold

2013-05-10 07:00:00| Climate Ark Climate Change & Global Warming Newsfeed

Politico: The amount of heat-trapping carbon dioxide in the atmosphere passed a symbolic milestone this week, scientists announced Friday, reaching levels that havent prevailed on the Earth since long before human civilization began. The long-expected announcement by the National Oceanic and Atmospheric Administration that CO2 concentrations had finally hit 400 parts per million at a key measuring station in Hawaii means little by itself. But its a sign that time is slipping away to head off or lessen...

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