Perhaps the greatest nightmare for investors in a commodity stock is that the commodity in question goes the way of coal. After more than a century of dominance in the U.S. and abroad, coal appears to have entered into a structural decline. The EIA and others see coal export volumes declining, domestic U.S. demand remaining questionable, and intense competition from natural gas continuing. A funny thing happened on the way to the graveyard for coal companies though – one of the industries greatest detractors, George Soros, appears to be stepping in as a supporter. Soros, whose $24 billion fortune is...