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"When natural gas prices dipped to multi-year lows in 2012 the future of coal appeared to be in doubt. Although it has remained the nation&amp;#039;s top fuel source, it was being squeezed out of the"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.aol.com/article/2013/06/25/environmental-groups-lose-their-cool-over-coal/20634328/>