Coal runs along a conveyor belt after being scraped off the wall by a shearer during longwall mining operations at the Consol Energy Bailey Mine in Wind Ridge, Pennsylvania, U.S., on Tuesday, May 14, 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
{"Image ImageDescription": "Coal runs along a conveyor belt after being scraped off the wall by a shearer during longwall mining operations at the Consol Energy Bailey Mine in Wind Ridge, Pennsylvania, U.S., on Tuesday, May 14, 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", "Image Copyright": "2013 Bloomberg"}