An out-of-control natural gas well in the Gulf of Mexico continued to burn Wednesday after it blew out and caught fire. Beams supporting some of the "Hercules 265 jack-up rig" have collapsed. U.S. Coast Guard via AP hide caption

itoggle caption U.S. Coast Guard via AP

China and India are projected to propel coal's challenge of oil as the world's top energy source within the next five years, according to a new study. Here, a man rides a bicycle toward a coal-fired power station in China's Guangdong province last year. Mark Ralston/AFP/Getty Images hide caption

itoggle caption Mark Ralston/AFP/Getty Images