The Huffington Post has an excellent feature titled The Dirty Secrets of Coal:
“Coal is a dirty and dangerous business. It produces more than half of the energy in the U.S. because it is a cheap resource, but it comes at a high human and environmental cost. The coal industry is the single largest producer of greenhouse gas emissions -- and that's just the beginning. We're taking a look at some of the dirtiest secrets the coal industry doesn't want you to know.”
See the dirty secrets by clicking here.