Many people think metal bands are only concerned with beer, women, and Satan. (And lots of them are!) But metal's always had a political and social consciousness bubbling under the surface. So it wasn't that hard at all to find metal songs dealing with issues of pollution, global climate change, extinction, and other issues relevant on April 22, better known as Earth Day. (Of course we also threw in some generally anti-human tracks, as well, since most of the problems besetting the Earth are pretty much our fault, as a species.) So check out this 25-song playlist which includes songs from Black Sabbath, Cynic, Fear Factory, Gojira, Killswitch Engage, Kreator, Megadeth, Metallica, Napalm Death, Nuclear Assault, Opeth, Pestilence, Rush, Sepultura, Slayer, Slipknot, Soundgarden, Testament, and Trivium! Enjoy, and Happy Earth Day! Eat something recycled, or whatever...