Photograph by Jake Dobkin Today between 8 p.m. and 9 p.m., people in timezones all over the world will be turning off their lights for Earth Hour. World Wildlife Fund started the event as a way to "deliver a powerful message to the citizens and leaders of the world about the need for action." Twenty-eight cities are officially participating--in San Francisco, the Golden Gate Bridge will go dark--others, like NYC and LA, are not.......