@MittRomney tweets related to: Chart, Century, Keeling, Curve, Edges

For the past few months, the Keeling Curve, which measures atmospheric carbon dioxide concentrations at Mauna Loa Observatory, has been rising toward its annual late-May peak. Right now it's at 399.5, and any day now it could pass 400 ppm for the first time in modern history. So take a nice long look.
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Chart of the Century: The Keeling Curve Edges Up to 400 ppm http://t.co/gCEQTIZHEq

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