”Lights Out San Francisco is a citywide energy conservation event on October 20, 2007. On this night, we invite the entire city of San Francisco to turn off all non-essential lighting for one hour. To promote long-lasting energy saving, we plan to distribute free compact fluorescent light bulbs throughout the city...We were inspired by a similar event recently held in Sydney, Australia, called Earth Hour. In Sydney, 2.2 million people participated. Their one hour of lights out meant that 24.86 tons of carbon dioxide were not released into the air - the equivalent of taking 48,613 cars off the road for one hour.” We’ll be turning our lights off to participate. Even Google is going dark today.