Green | October 14, 2009 | 0 comments

Last time carbon dioxide levels were this high: 15 million years ago, scientists report

source: http://www.physorg.com/news174234562.html

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ScottP
You would have to go back at least 15 million years to find carbon dioxide levels on Earth as high as they are today
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    Green
  2. tags:
    Carbon Footprint,  Carbon Emissions,  Carbon,  Carbon Dioxide,  2 more
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