New York Times: Kyle Buck heaved open the door of a makeshift bin abutting his suburban ranch house. Staring at a two-ton pile of coal that was delivered by truck a few weeks ago, Mr. Buck worried aloud that it would not be enough to last the winter. “I think I’m going through it faster than I thought I would,” he said. Aptly, perhaps, for an era of hard times, coal is making a comeback as a home heating fuel. Problematic in some ways and difficult to handle, coal is nonetheless a …