May 28 Energy & Environment Appalachian Coal Is A Major Source Of Methane, A Potent Greenhouse Gas Appalachian coal mines emit more than a million tons of methane a year, and overall the region is the largest U.S. source of the potent greenhouse gas, according to new research. The region was the source of 3 million tons of methane in 2019, 1.1 million tons of it from coal mining, according to European […] By Curtis Tate May 28 Energy & Environment Appalachian Coal Is A Major Source Of Methane, A Potent Greenhouse Gas Curtis Tate