By Phil
Yesterday, for an hour, the world went dark. In cities like Toronto, Sydney, Chicago, San Francisco, Bangkok, Bogota, Manila and Copenhagen, offices and homeowners were encouraged to turn off their lights from 8-9 PM as a demonstration of how energy conservation and climate change are linked. The effort, dubbed Earth Hour by the World Wildlife Fund, a key organizer of the event, hoped to involve more than 100 million people worldwide. In Sydney alone, more than 2.2 million people participated, while in Chicago, 200 downtown buildings went black.