Economist: MITT ROMNEY’S charge that America had declared “war on coal” may not have won him last year’s presidential election. Yet this once-mighty industry is struggling, squeezed by the plummeting cost of natural gas and a torrent of tough new environmental rules. Last year 37.4% of American electricity production came from coal, down from 48.5% in 2007. The Energy Information Administration expects a slight rise this year as gas prices begin to creep up. But further restrictions on power-station emissions…

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