It's a gas


  • Anonymous


Significant amounts of methane, a byproduct of coal formation that can be an explosion hazard in underground mines, are released into the air through mining. At the Environmental Protection Agency's (EPA) request, the U.S. Bureau of Mines analyzed U.S. underground coal mines to determine how much methane they add to the atmosphere. USBM scientists found that 158 mines each emitted at least 0.1 million cubic feet of methane per day during 1993 for a daily total of about 260 million cubic feet.