We've hit the carbon level we were warned about (400ppm), and it may have dire consequences

Monday, May 13, 2013

Over the last couple weeks, scientists and environmentalists have been keeping a particularly close eye on the Hawaii-based monitoring station that tracks how much carbon dioxide is in the atmosphere, as the count tiptoed closer to a record-smashing 400 parts per million. Thursday, we finally got there: The daily mean concentration was higher than at any time in human history, the National Oceanic and Atmospheric Administration (NOAA) reported Friday.

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