The 2011 average annual concentration of CO2 in the atmosphere (Mauna Loa Observatory) is 391.57 parts per million (ppm). The 2010 average is 389.78 ppm.
For the past decade (2002-2011) the average annual increase is 2.07 ppm per year. The average for the prior decade (1992-2001) is 1.6 ppm per year. Annual data for 2011 was first posted January 5, 2012, by the National Oceanic and Atmospheric Administration (NOAA) in the United States.
Since the 1958 start of precision CO2 measurements in the atmosphere, the annual mean concentration of CO2 has only increased from one year to the next. The CO2 data below provide a simple view of the annual trend.
Year CO2 (ppm) Notes
2011 391.57
2010 389.78
2009 387.38 Copenhagen Accord
2008 385.59
2007 383.77
2006 381.90
1997 363.71 Kyoto Protocol
1992 356.38 Earth Summit in Rio de Janeiro
1987 349.16 The last year when the annual CO2 level was less than 350 ppm
1959 315.97 The first year with a full year of instrument data
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| http://www.stephaniemcmillan.org/codegreen/2012/06/04/new-campaign-2/ |
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