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.
Lights out at UN headquarters for Earth Hour
The United Nations headquarters in New York has switched off its lights as the city went dark for Earth Hour. The UN took part in the initiative alongside the WWF.
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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