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Table 1 Annual trend of Carbon Dioxide (CO2) concentrations as measured by the Earth System Research Laboratory

From: The need for UN climate change policy reformation

Year CO2 (ppm) Notes
2015 400.38  
2014 398.55  
2013 396.48  
2012 393.82  
2011 391.63  
2010 389.85  
2009 387.37 Copenhagen Accord
2008 385.59  
2007 383.76  
2006 381.90  
1997 363.71 Kyoto Protocol
1992 356.38 Earth Summit in Rio de Janeiro
1987 349.16 The year when the annual CO2 level was less than 350 ppm
1959 315.97 The first year with a full year of instrument data
  1. Source of Annual CO2 Data: NOAA-ESRL Data File Created January 6, 2015