United Press International: A soaring demand for coal is outstripping capacity in some regions and causing environmental and economic worries in the United States and abroad. Coal prices have risen 50 percent in the last five months and consumption has increased 30 percent in the past six years, The Washington Post reported. Demand is expected to increase as emerging markets, such as China and India, supply electricity to more people. In China, demand is gaining 10 percent a year. Last year, China …