Photographs: Tim Wimborne/Reuters
A combination picture shows power lines crossing in front of the Sydney Harbour Bridge and city skyline before Earth Hour, and during Earth Hour.
Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 pm local time, is meant as a show of support for tougher action to confront climate change.
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For Earth Hour, major cities go DARK
Photographs: Carlos Barria/Reuters
A combination photo shows Shanghai's financial district before and during Earth Hour.
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For Earth Hour, major cities go DARK
Photographs: Tyrone Siu/Reuters
A combination picture shows Hong Kong's central financial district before and during Earth Hour.
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For Earth Hour, major cities go DARK
Photographs: Jason Lee/Reuters
A combination photo shows a view of the Badaling section of the Great Wall before and during Earth Hour on the outskirts of Beijing.
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For Earth Hour, major cities go DARK
Photographs: Mukhtar Kholdorbekov/Reuters
A combination shows the 97-metre monument Baiterek before and during Earth Hour in Kazakhstan's capital Astana.
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For Earth Hour, major cities go DARK
Photographs: Supri/Reuters
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For Earth Hour, major cities go DARK
Photographs: Bazuki Muhammad/Reuters
A combination picture shows the Petronas Twin Towers in Kuala Lumpur, a Malaysian landmark, pictured as lights are turned off during Earth Hour and turned on after Earth Hour.
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For Earth Hour, major cities go DARK
Photographs: Pichi Chuang/Reuters
A combination picture shows the Taipei 101 building before and during Earth Hour in Taipei.
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For Earth Hour, major cities go DARK
Photographs: Matthew Lee/Reuters
A combination photo of Marina Bay Sands hotel and ArtScience Museum before and during Earth Hour in Singapore
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