In 30 years of teaching, the author never taught explicitly about coal. Coal appeared in his social studies curriculum solely as a labor issue, and coal was mostly invisible in his history classes. The world cannot afford this kind of curricular invisibility today. Forty percent of the main greenhouse gas produced in the United States, carbon dioxide, comes from burning coal for electricity; so does two-thirds of all the sulfur dioxide pollution. Coal companies have sliced the tops off 500 mountains in Appalachia and dumped the waste in the valleys, burying 1,200 miles of streams and poisoning residents' water. So the author decided that it was time to break his curricular silence on coal. In this article, the author shares how he and his colleagues, Tim and Julie, used an industry-designed game in teaching their students about coal mining.