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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Astronaut tweets pictures of cities prior to Earth Hour

Canadian astronaut Commander Chris Hadfield, currently on board the International Space Station, has been tweeting images of major cities prior to Earth Hour.

The view of New York City from the International Space Station. Credit: Twitter/@Cmdr_Hadfield

He wrote, "New York City, lit up like a bulb. The Statue of Liberty is clearly visible in the night from above".

The picture shows Detroit and Windsor, where Michigan meets Ontario. Credit: Twitter/@Cmdr_Hadfield

The commander also highlighted that "spiderwebs of light expanding out from the dark river border" could be seen of Detroit and Windsor.

Chris Hadfield to photograph planet during Earth Hour

Commander Chris Hadfield, the astronaut currently living aboard the International Space Station, has tweeted that he will be photographing people's efforts during Earth Hour later today.

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