Greening Man
With 25,000 people camping out in the desert for a week, Burning Man abides by the "leave no trace" principle--efforts organizers are now expanding from the festival's northern Nevada site to the entire planet. For this year's event, tickets are being printed on tree-free paper; the radio station, medical outpost, and other facilities will be run on biodiesel; and a green art theme will see Black Rock Desert decorated with the likes of solar-powered sunflowers and a trash-fueled 80-foot mechanical slug.