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 |