Canada's CN Tower, normally aglow with light displays, is seen dark between office towers in Toronto, March 29, 2008. Non-essential lighting in government and office buildings as well as residences was turned off for one hour to publicize the effects of climate change.
This combination of two images of the Sydney skyline were photographed at 8:20pm on March 28, 2008 (top) and during earth hour at 8:20pm on March 29, 2008. Thousands of lights that illuminate office buildings, public structures and monuments were switched off Saturday evening, darkening the city's iconic skyline for one hour, in an effort to publicise the effects of climate change.
A combo picture shows the Royal Castle in Stockholm, Sweden, moments before (top) and after the lights were switched off for Earth Hour, March 29, 2008. The Sydney Opera House to San Francisco's Golden Gate Bridge went dark as people switched off lights in their homes and skylines dimmed around the world on Saturday to show concern with global warming.
Up to 30 million people were expected to have turned off their lights for 60 minutes by the time "Earth Hour" -- which started in Suva in Fiji and Christchurch in New Zealand -- completed its cycle westward.
More than 380 towns and cities and 3,500 businesses in 35 countries signed up for the campaign that is in its second year after it began in 2007 in Sydney, Australia's largest city.
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