GHGs March 2014
Atmospheric CO2 continues its exponential increase, and is now virtually at 400 parts per million.
Methane’s renewed post 2007 increase is now a new increased trend, which according the latest science is due to methane emissions from warming wetlands (tropical and subarctic) and some fugitive emissions from the expanding natural gas industry. Methane is now at 1850 parts per billion which is more than a two and a half times increase since industrialization. The highest methane level is much higher still, recorded as 2015 parts per billion in Northern Alberta- at the southern edge of the vast Canadian northern wetlands.
Nitrous oxide continues to increase at the fastest rate of the three main GHGs.
State of the Climate 