Coal mining declines in U.S., worldwide

Though coal is the United States' main source of electricity generation, mine starts are beginning to decline, according to the U.S. Energy Information Administration. … Continue Reading http://www.pennenergy.com/articles/pennenergy/2015/09/coal-mining-declines-in-u-s-worldwide.html?cmpid=EnlDailyPowerSeptember292015&eid=288118515&bid=1188210