WMO Greenhouse Gas Bulletin - No.10: Climate Summit edition: The State of Greenhouse Gases in the Atmosphere Based on Global Observations through 2013

This tenth WMO/GAW Annual GHG Bulletin reports atmospheric abundances and rates of change of the most important long-lived greenhouse gases – carbon dioxide, methane and nitrous oxide – and provides a summary of the contributions of the other gases. These three, together with CFC-12 and CFC-11, account for approximately 96%[5] of radiative forcing due to LLGHGs (Figure 1). For the first time, this bulletin contains a section on ocean acidification prepared in collaboration with the International Ocean Carbon Coordination Project (IOCCP) of the Intergovernmental Oceanographic Commission of the United Nations Educational, Scientific and Cultural Organization (IOC-UNESCO), the Scientific Committee on Oceanic Research (SCOR), and the Ocean Acidification International Coordination Centre (OA-ICC) of the International Atomic Energy Agency (IAEA).