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Last Updated: Friday, 22 June 2007, 09:25 GMT 10:25 UK
In pictures: Lights Out London

London Eye Wednesday night and Thursday night (below)

Some of the city's most famous landmarks were plunged into darkness on Thursday night for an hour to highlight climate change.

Piccadilly Circus in darkness

The normally blazing advertising hoardings at Piccadilly Circus were dimmed...

Tower Bridge during the lights out

... while the landmark Tower Bridge took on a menacing shape in the darkness.

Big Ben and Commons in darkness

Even MPs took part - the Palace of Westminster and St Stephen's Tower were in darkness

City Hall in darkness on Thursday night

Mayor Ken Livingstone's HQ City Hall was unrecognisable as it joined the shutdown.

View towards city across the Thames (Pic: Chris Constantine)

Londoner Chris Constantine snapped this shot. An hour's "lights-out" in the capital could save enough power to run 3,000 televisions.






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