ANGUS DUNCAN – What was the biggest energy story of 2013 in the United States? Most observers would point to the vast, unlooked-for quantities of natural gas and oil released by new “fracking” recovery techniques. National oil production has surged by 30 percent just since 2011. Five yearsago the natural gas industry was looking for sites to import liquefied natural gas (LNG); today it’s flipping those sites around to export the stuff. But, the real energy story of 2013 may turn out to be the death of coal.