RECORD OF ATMOSPHERIC CARBON DIOXIDE FROM THE YEAR 1 TO 2011 CE
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FIGURE 14.16 Following 18 centuries of oscillating around an average concentration of approximately 280 parts per million (ppm), atmospheric carbon dioxide concentration increased rapidly after 1800, increasing over 100 ppm by the year 2011. (Data from Etheridge et al., 1996; MacFarling Meure et al., 2006; Scripps CO2 Program, http://scrippsco2.ucsd.edu)