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    Counting carbon: pre-industrial emissions make a difference

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    carnegiescience

    by carnegiescience

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    When evaluating the historic contributions made by different countries to the greenhouse gasses found in Earth's atmosphere, calculations generally go back no further than the year 1840. New research from Carnegie's Julia Pongratz and Ken Caldeira shows that carbon dioxide contributions from the pre-industrial era still have an impact on our climate today.