Last Updated: Saturday, 31 March 2007, 10:41 GMT 11:41 UK
Sydney in climate change blackout
Sydney's famous skyline (top image) was shrouded in darkness
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Lights have been turned off across Australia's largest city, Sydney, in a hour-long event aimed at raising awareness of global warming.
At 1930 (0930 GMT) the city's skyline dimmed and normally bright landmarks like the Opera House and the Harbour Bridge went dark.
The so-called Earth Hour is supported by the New South Wales government, environmental groups and businesses.
The city of four million people is aiming to become the first anywhere to achieve a blackout on this scale.
Every day millions of lights and computers are left on in deserted office blocks as well as in apartments and houses.
Campaigners have said that simply switching them off could reduce Sydney's greenhouse gas emissions by 5% over the next year.
