The United States coal industry and the jobs that support it have been in decline for decades as a result of environmental concerns, automation in mining and slowdowns in manufacturing industries that burned coal for power.......And these days, no matter who is president, coal is at the mercy of market economics. Coal’s No. 1 rival is cheap, cleaner-burning
natural gas — which could become an even more potent competitor under the incoming administration....“I don’t think the Trump presidency will have a material impact on bringing coal miners back to work,” said Ted O’Brien, a coal analyst...