Throughout coal mining country of the Eastern U.S. you will find streams that run a peculiar rusty orange. It’s the result of pollution called acid mine drainage, or AMD. It’s estimated that about 10,000 miles of streams are polluted by AMD in Pennsylvania and West Virginia alone. In fact, researchers have calculated that every second, coal mines throughout the region are pumping out about 3,000 cubic feet of AMD. That’s roughly equal to an average May day’s flow of water in the Monongahela River as it winds through the region.