The Congressional Research Service reports that nearly all American met coal comes from Appalachia — West Virginia alone accounting for almost half of U.S. output — and that China is the world's largest consumer of it. (Photo by Karen Kasmauski/Getty Images)I grew up on a Blue Ridge farm in Carroll County, Virginia, close enough to Galax to know what a furniture town sounds like and smells like — the cut oak and poplar, the lacquer, the lumber t…