Planet goes dark for Earth Hour

People across the world switched off their lights last night in support of a global effort to tackle climate change.

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UK landmarks switch off lights for Earth Hour

Landmarks across the UK switched off their lights last night in support of a global effort to tackle climate change.

Elizabeth Tower, which houses Big Ben in London, illuminated prior to the light being turned off to mark WWF's Earth Hour 2013 Credit: Lewis Whyld/PA Wire/Press Association Images

Elizabeth Tower, which houses Big Ben in the Palace of Westminster, the Southbank Centre for arts on the banks of the River Thames and Buckingham Palace all went dark at 8.30pm for Earth Hour.

Elizabeth Tower, which houses Big Ben in London, in darkness as the lights were turned off to mark WWF's Earth Hour 2013 Credit: Lewis Whyld/PA Wire/Press Association Images

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