President-elect Donald Trump promised to revive the U.S. coal industry, but many industry experts are skeptical.

Maryland environmental officials filed a petition Wednesday asking the EPA to crack down on 19 coal plants in Indiana, Kentucky, Ohio, Pennsylvania and West Virginia.

The Knox County Planning Commission voted this week to give Sunrise Coal permission for the $5 million project on rural land it owns near the town of Bruceville.

Five coal plants in Indiana ranked in the top 100 for both toxic and greenhouse gas pollution - more than any other state.

A new study asks what would happen if coal workers were retrained to produce a different type of energy

Some, like Indianapolis Power and Light's plant in Indianapolis, are converting to run on natural gas.

Indiana used 37-percent less coal for electricity generation between 2007 and 2015. Only Ohio and Pennsylvania saw a larger decrease.

A group of environmental and health advocates are especially concerned about Indiana's coal ash ponds and protecting federal legislation to clean them up.

The bankruptcy filing of the nation's biggest coal company will likely have repercussions in Indiana.

Coal industry representatives in Indiana, one of the nation's top coal-producing states, say the Supreme Court's stay of the Environmental Protection Agency's Clean Power Plan has little immediate effect on the state.