Nice set of charts and facts on the record levels of greenhouse gases:
The average mixing ratios of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) reached record level in 2009,WMO reported.
* CO2 concentrations ~ 386.8 ppm
* CH4 ~ 1,803 ppb
* N2O ~ 322.5 ppb
These values are greater than the corresponding atmospheric concentrations in pre-industrial times (~1750) by 38%, 158% and 19%, respectively.
In the twenty year period between 1990 and 2009, the combined radiative forcing””the balance between atmosphere’s incoming and outgoing radiation””for all persistent greenhouse gases increased by 27.5%, with CO2 accounting for about 80% of the increase, according to the NOAA Annual Greenhouse Gas Index.
A 27% forcing in just twenty years is pretty huge.