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44880For instant climate change, just add one large comet : Palaeocene's end

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  • Teresa Binstock
    Oct 18, 2013
      For instant climate change, just add one large comet.

      A comet may have sent temperatures soaring 55 million years ago. Two geologists claim they have evidence that carbon dioxide levels in Earth's atmosphere more than doubled in a single year at the end of the Palaeocene.