A combination picture shows the Canary Wharf financial district during mid-evening on March 26, 2009 and during Earth Hour (L-R) in East London March 28, 2009. More than 80 countries have signed up for Earth Hour on Saturday in which homes, office towers and landmarks will turn off their lights from 8.30pm local time to raise awareness about climate change and the threat from rising greenhouse gas emissions
REUTERS/Toby Melville (BRITAIN CITYSCAPE)
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