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See who signed up in 2010

The big switch-off in 2010 and was a huge success!

Millions of people around the world switched off their lights for WWF’s Earth Hour on 27 March.

Sign up now to join in the next Earth Hour lights-out, 26 March 2011!



It's not too late! You can still sign up to show you care about climate change.

2010 sign ups