(Agencies)
Updated: 2008-03-29 21:09

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. [Agencies]

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