Media Research poster developed on the completion of this MScCCAFS project Source: https://annemariayritys.com/2017/11/16/climate-forcing-methane/ Major sources and sinks for methane. The size of the arrow indicates the relative contribution a source makes to the global total. Currently, methane emissions exceed removal rates by about 10 million tons per year. Image via NOAA Climate.gov/Global Carbon Project.Source: https://earthsky.org/earth/global-methane-levels-hitting-new-highs Methane sources Source: http://www.grida.no/resources/6608 AWD… And what’s that then? Colomb et al., 2013’s decision process for selecting a GHG emissions calculator.