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 more than 10Tg per year in the United States.
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. 
