Quick little update from the World Meteorological Organization:
The amount of greenhouse gases in the atmosphere reached a new record high in 2011, according to the World Meteorological Organization. Between 1990 and 2011 there was a 30% increase in radiative forcing -- the warming effect on our climate -- because of carbon dioxide (CO2) and other heat-trapping long-lived gases.
Since the start of the industrial era in 1750, about 375 billion tonnes of carbon have been released into the atmosphere as CO2, primarily from fossil fuel combustion, according to WMO’s 2011 Greenhouse Gas Bulletin, which had a special focus on the carbon cycle. About half of this carbon dioxide remains in the atmosphere, with the rest being absorbed by the oceans and terrestrial biosphere.
That's from the specifically titled "Press Release No. 965," which I appreciate because it suggests a scientist completing his calculations, then wearily turning to his typewriter to knock out yet another press release about how doomed we are.
Press Release No. 965 includes graphs showing how three of those gases -- carbon dioxide, methane, and nitrous oxide -- have increased since the 1980s.