Far below the Appalachian Mountains, in a space barely big enough to stand up straight, Bobby Combs works a job his father and his grandfather worked.

Coal-mining is the highest-paying job available to him in eastern Kentucky. As he skillfully maneuvers a massive machine and rips into a seam of coal, though, Combs wonders if the family tradition ends with him.

"It's not looking good," he says, dirt smudging his face.

Coal has come under the crosshairs of the Obama administration in the push to transition to renewable energy sources. Coal mines are burdened with a never-ending stream of federal regulations.

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