4. Dave Matthews Band

Dave Matthews Band doesn't want to go green alone: It is willing to go green for everyone else, too. The band, through environmental nonprofit Reverb, has calculated the CO2 emissions from every stop on its upcoming extensive summer tour and has purchased the renewable energy credits through NativeEnergy to make up for the footprint left by each venue, hotel, flight, tour vehicle and even fan travel. But DMB devotees can make their own contributions by signing up to a carpool service online. Tour buses and trucks this summer will run on biodiesel and, backstage, the band plans to feast on local and organic foods on their reusable catering products. The five-piece plans to continue erecting an "eco-village" at each show to inform concertgoers of ways they can help save the environment. Bassist Stephan Lessard also told Billboard recently that the band wants to integrate issues of water conservation into the mix. His interest extends from his contributions to scoring the recent IMAX documentary "Grand Canyon Adventure: River at Risk," which brings to light water economy and ecology in the United States. –Katie Hasty