CO2 Levels Highest in Two Million Years

National Geographic by Maggie Koerth-Baker | Jun. 18, 2009 (News Report)

By studying chemicals in long-dead, single-celled plankton called foraminifera, though, the team behind the new study was able to extend the climate record back 2.1 million years Full Story »

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 by Glenn LaBauve - Jun. 22, 2009
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