"Turn off the lights!"
Earth Hour was created by WWF [World Wildlife Fund] in Sydney, Australia in 2007, and in one year has grown from an event in one city to a global movement. In 2008, millions of people, businesses, governments and civic organizations in nearly 200 cities around the globe will turn out for Earth Hour. More than 100 cities across North America will participate, including the US flagships–Atlanta, Chicago, Phoenix and San Francisco and Ottawa, Montreal, Toronto and Vancouver.
Google joins Earth Hour: