Deckhands aboard the Consol Energy Champion Coal tow boat walk along the center of the barges on the Monongahela River, during transport outside Pittsburgh, Pennsylvania, U.S., on Wednesday, May 15, 2013. Coal’s prospects are improving after its share of U.S. power generation fell last year to 34 percent, the lowest since at least 1973, Energy Department data show. Hotter temperatures this summer that prompt American households to use more air conditioning will boost demand for coal and the railroads that ship it. Photographer: Ty Wright/Bloomberg via Getty Images
