I was at a Guster concert a few weeks ago, when the lead singer/guitarist, Adam Gardner, encouraged concertgoers to offset their travel to the show by buying carbon offsets, in the form of wind tags at the merch booth. It turns out that in 2004 Gardner, and his wife, Lauren Sullivan, founded Reverb, a non-profit that seeks to educate music fans about environmentalism by greening up touring and concerts.

Because of the high environmental costs of touring, artists like The Dave Matthews Band, Jack Johnson, O.A.R, Alanis Morissette, Bonnie Raitt, and the Red Hot Chili Peppers are now fueling tour busses with biodiesel, setting up recycling at shows, and powering concerts with renewable energy, in conjunction with Green Highway. Reverb also connects bands with environmental organizations to create interactive eco-villages at venues. Reverb sponsors the Campus Consciousness Tour, bringing expanded eco-villages to college campuses along with shows, to encourage environmental consciousness among college students and college communities.

Guster and friends aren't the only musicians trying to lighten their eco-footprint. Willie Nelson's tour bus runs on biodiesel, and many popular summer festivals, including Bonnaroo and Wakarusa, have booths where concertgoers can offset their travel. At Wakarusa, all cups, utensils, and other food packaging is either compostable, biodegradable, or recyclable, and they provide on-site facilities to do all three. In fact, when you arrive at Wakarusa to camp, you are given bags to encourage you to recycle aluminum, cardboard, glass, plastic, and steel.

If you are planning on attending a summer tour, stop by and purchase a carbon offset in the vendors area. Think of it this way: drink one less overpriced beer, buy an offset, and feel even better about your concert choices.