Scottish singer KT Tunstall joined Guster back in 2007 at the 14th annual EarthFest show in Boston to support environmentalist music, but it was far from her first foray into green causes. Dating all the way back to her 2004 platinum debut album, Eye to the Telescope, Tunstall has worked to neutralize her carbon production, first by planting more than 1,500 trees in Scotland and continuing to donate to renewable energy causes in Sri Lanka. Working with the Carbon Neutral Company, which provides estimates in usage and reduction, Tunstall tallies everything from the electricity used in the studio to the fuel used to tour. "The worst thing I've ever done to the environment is to wee in the sea," she told The Independent in 2005. "My copious use of hairspray as a teenager didn't help much either." She also worked with TreeHugger to promote climate change awareness through music and fashion at the 2010 Shift Festival.
Photo: KT Tunstall backstage at the Live Earth New York event in East Rutherford, New Jersey, July 7, 2007.