A counter-culture arts festival which champions alternative living is being vetted by environmentalists for its contribution to global warming. Burning Man bans the sale of anything but ice and coffee and declares clothing optional. The festival, which is expected to draw nearly 40,000 people to the Nevada desert this week, is described as an "experiment in temporary community dedicated to radical self-expression and radical self-reliance". It has few rules, no structure and features performances, installation art and music, which culminate in the symbolic burning of a large wooden man. A group of San Francisco scientists, calling themselves Cooling Man, have...