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 â€œfrackingâ€ 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 itâ€™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.