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Every year during March, hundreds of millions of people switch off their lights (and other non-essential electrical equipment) for 1 hour in support of Earth Hour.  

Major iconic buildings join in by switching off all lights including the Sydney Opera House, The Empire State Building, The Golden Gate  Bridge and many more.  Many people also organise activities for their friends and families in support of Earth Hour.  Find out more and show your support for Earth Hour by visiting their website