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Scary CO2 Milestone Reached

At 400 parts per million, we are far beyond what's natural or even what's been seen since humans evolved. Continue reading →

May 11, 2013
11:04 AM EDT
The Mauna Loa Observatory has the world's longest record of direct atmospheric carbon dioxide readings. But that's just part of the story. Credit: Larry O'Hanlon
Credit: Scripps Institution of Oceanography, U.C. San Diego
Credit: Scripps Institution of Oceanography, U.C. San Diego

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