Tomorrow, March 29, from 8 p.m. to 9 p.m. millions of people will turn of their lights to make a statement about climate change. It's all a part of Earth Hour, a green event conceived by the World Wildlife Fund. Over 100 U.S. cities are participating in the do-goodery, including Atlanta, Chicago, Phoenix, and, of course, San Francisco. While this won't do much insofar as saving the planet--which is doomed!--it will make a dark and profound statement about conservation and the environment....