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How much has the amount of CO2 in the atmosphere changed in history?

April 26, 2017atmosphere changed CO2 History

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How much has the amount of CO2 in the atmosphere changed in history?

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The figure below show results of CO2 measurements of air trapped in ice cores taken at the Law Dome site in Antarctica, along with present day measurements at the CMDL Mauna Loa Observatory in Hawaii. CO2 amounts have increased about 35% in the last 200 years. http://www.cmdl.noaa.gov/infodata/faq_cat-3.