The paper discusses a cofunded, Gas Research Institute/EPA project to quantify methane emissions to the atmosphere resulting from operations in the natural gas industry. Study results will measure or calculate all methane emissions, from production at the well and up to, but not including, the point of final use. When these data are combined with those of other studies than quantify greenhouse gas emissions from methane consumers (i.e., various combustion sources), a definitive comparison of the relative environmental effects of using methane versus other fuels will be possible.