Best Songs / Music For An Outdoor Enthusiast and Environmentalist (Like Eddie Vedder's Into The Wild)?

I am an active climber, back packer, mountain biker, trout bum, and back country skier. My favorite album right now is Eddie Vedder's Into The Wild. I am looking for similar Artists, Albums, Songs, Etc. Or just music that fit's my lifestyle. What are some recommendations? Songs with Environmental overtones and problems fitting into society are also great.