UK landmarks go dark for Earth Hour
Landmarks across the UK have gone dark for Earth Hour, with lights switched off from 8.30pm for an hour, as part of a global effort to raise awareness about climate change.
Livestream: Earth Hour with Sophie Ellis-Bextor
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World landmarks switch off lights for Earth Hour
Cities across the world switched off their lights to mark this year's 'Earth Hour' movement on Saturday.
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UK landmarks go dark for Earth Hour
Big Ben, the Houses of Parliament and UK landmarks went dark for an hour tonight as the UK took part in Earth Hour.
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Sophie Ellis-Bextor unveils giant light-switch
London prepares for Earth Hour