Coaling towers stand at the Arch Coal Inc. Sentinel Prep Plant in Philippi, West Virginia, U.S., on Wednesday, Jan. 13, 2016. Arch, the St. Louis-based holder of the second-largest reserve of coal in the U.S., filed for creditor protection Monday, with an agreement to erase $4.5 billion in debt. Photographer: Luke Sharrett/Bloomberg via Getty Images
