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CO2 Concentration at Mona Loa Observatory Since 1959 CO2 Concentrations Last 800,000 Years The atmospheric concentration of CO2 is continuing to increase at about 3.2ppm/year, having surpassed 400ppm for several months in 2014. CO2 Concentrations Since 1700 CO2 Concentration at Mona Loa Observatory Since 1959 CO2 Concentration at Mona Loa Observatory Since 1959 Source: Scripts URL:     http://keelingcurve.ucsd.edu/ CO2 Concentrations Last 800,000 Years CO2 Concentrations Last 800,000 Years The atmospheric concentration of CO2 is continuing to increase at about 3.2ppm/year, having surpassed 400ppm for several months in 2014. Source: Scripts URL:     http://keelingcurve.ucsd.edu/ CO2 Concentrations Since 1700 Source: Scripts URL:     http://keelingcurve.ucsd.edu/ CO2 Concentrations Since 1700 CO2 Concentrations Since 1700 Source: Scripts URL:     http://keelingcurve.ucsd.edu/