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

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You would have to go back at least 15 million years to find carbon dioxide levels on Earth as high as they are today
  1. groups:
    Green
  2. tags:
    Carbon Footprint,  Carbon Emissions,  Carbon Dioxide,  Carbon, 2 more + add
ScottP
  • added October 14, 2009

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