Twenty-four major cities worldwide, plus 300 smaller cities, turned off their lights for Earth Hour on March 29, 2008, at 8:00 p.m. U.S. cities participating in this event included Atlanta, Chicago, Phoenix, and San Francisco. Cities worldwide, such as Bangkok, Budapest, and London also joined in this effort. Sydney, Australia, the first city to recognize Earth Hour in March of 2007, also participated as the city turned off lights at all major landmarks and homes and businesses turned off their lights.

Earth Hour is organized by the World Wildlife Organization and is intended to bring awareness to the need to take action against global warning. Participants are asked to turn off all nonessential lights for the designated hour. The next Earth Hour is planned for March 28, 2009.

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