Emmylou Harris joins Naomi Judd and Kathy Mattea in lending their voices to the effort to stop the practice of mountaintop removal mining in the Appalachian Mountains of West Virginia, Virginia, Kentucky, Tennessee, and Maryland.

In a series of video messages, Harris, her fellow artists, and others are joining with Robert F. Kennedy Jr. and local and national organizations to help raise public awareness about an upcoming march to end mountaintop removal and a new documentary feature film about the issue called The Last Mountain, set for release in early June. You can watch Harris's video below.

"Basically, they're blowing tops of mountains to get to a small amount of coal," Harris explains in the video. "In doing that, they're destroying these mountains forever. The resulting pollution is going into rivers, destroying the water supply, destroying homes, families that have lived there for generations."

Watch the video, featuring Harris's song "The Road," off her recently released Nonesuch album, Hard Bargain, here:

Harris is on tour now in Europe and returns to the States to perform starting in June. For details, visit nonesuch.com/on-tour.