The CH4 (methane) growth rate, which makes up 15% of the Climate Change Issue Category, is calculated as the average annual rate of increase or decrease in raw methane emissions over the years 2008-2017. It is then adjusted for economic trends to isolate change due to policy rather than economic fluctuation.

Original source: Potsdam Institute for Climate Impact Research.

When using this variable, please cite both EPI and the original source.