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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