Decade Total Increase Annual Rate of Increase
2001 – 2010 20.38 ppm 2.04 ppm per year
1991 – 2000 15.24 ppm 1.52 ppm per year
1981 – 1990 15.48 ppm 1.55 ppm per year
1971 – 1980 13.00 ppm 1.30 ppm per year
1961 – 1970 8.77 ppm 0.88 ppm per year
Source:
Annual CO2 Data: Scripps / NOAA data for atmospheric CO2*
*Calculations are made by CO2Now.org using annual data (Mauna Loa Observatory).
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