Methane is a primary component of natural gas, and its process inevitably releases a significant amount of methane into the atmosphere, and according to the EPA Inventory of U.S Greenhouse Gas Emissions and Sinks: 19902015 report, 2015 methane emissions from natural gas and petroleum systems totaled 6.5 Tg per year in the United States, and has a 20-year global warming potential of methane is 84, that is, over a 20-year period, it traps 84 times more heat per mass unit than carbon dioxide (CO2) and 32 times the effect when accounting for aerosol interactions.
According to the EPA Inventory of U.S Greenhouse Gas Emissions and Sinks: 19902015 report, 2015 methane emissions from natural gas and petroleum systems totaled 8.1 Tg per year in the United States. 
