From a recent Arts & Crafts press release:
With the help of Reverb, Stars are going carbon neutral on their current U.S. tour. Buy a carbon-offset sticker at a Stars show, and help build clean, renewable energy sources. Proceeds from each sticker will neutralize the CO2 created from 150 miles of driving. You can help fight global warming by purchasing a sticker or a water bottle at a Stars show. For more information go here.