September 28, 2013
FILE - In this Wednesday, July 31, 2013, file photo, a worker levels the coal on a freight train in Taiyuan in northern China's Shanxi province. Coal has been the dominant fuel for power generation for a century because it is cheap, plentiful, and easy to ship and store. But it emits a host of pollution-forming gases and soot particles, and double the greenhouse gas emissions of its closest fossil fuel competitor, natural gas.
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