The overall purpose of the Global Greenhouse Gas Watch (GGGW), endorsed by the 19th World Meteorological Congress, is to strengthen the information made available to Parties to the UNFCCC to support their climate change mitigation efforts. Such efforts aim to reduce net anthropogenic greenhouse gas emissions and/or directly remove greenhouse gas (GHGs) from the atmosphere. Atmospheric concentrations of the main GHGs (CO2, CH4 and N2O) are still exhibiting unabated growth.