According to the World Meteorological Organization, concentration levels of CO2, methane, and nitrous oxide in the atmosphere grew more than the average in the past decade. The increase is about one third since 1990. Of the gases, CO2 is the most important one tracked with 50% of the Co2 emitted by human activities remains in the atmosphere. According to the World Meteorological Organization there were 393.1ppm of carbon dioxide in the atmosphere in 2012, an increase of 2.2ppm over 2011.This was above the yearly average of 2.02ppm. These concentration levels are no good news and they will continue to increase for years to come.
http://www.bbc.co.uk/news/science-environment-24833148
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