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The concentration of carbon dioxide (CO 2) in the atmosphere has increased from approximately 277 parts per million (ppm) in 1750 (Joos and Spahni, 08), the beginning of the industrial era, to 4050±01 ppm in 17 (Dlugokencky and Tans, 18;K A @ Q E T $ Ó Ultra High Energy Resolution Eels Microscopy And Microanalysis Cambridge Core C a j o l i n g
