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We just passed the climates grim milestone

2013-05-11 15:00:00| Climate Ark Climate Change & Global Warming Newsfeed

Grist: 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, NOAA reported. Don`t worry: The earth is not about to go up in a ball of flame. The 400 ppm mark is only a milestone,...

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