WMO Greenhouse Gas Bulletin - No.8: The State of Greenhouse Gases in the Atmosphere Based on Global Observations through 2011

This eighth WMO/GAW Annual Bulletin reports on the atmospheric burdens and rates of change of the most important long-lived greenhouse gases (LLGHGs) – carbon dioxide, methane, nitrous oxide, CFC-12 and CFC-11 – and provides a summary of the contributions of the other gases. These five major gases account for approximately 96%[4] of radiative forcing due to LLGHGs.