WWF’s Earth Hour is a simple idea that’s quickly turned into a global phenomenon. Hundreds of millions of people turning off their lights for one hour, on the same night, all across the planet. It’s about appreciating the brilliant world we all share – and how we need to protect it. Not just for an hour a year, but every day.

Have a look at our short film to find out more. Sign up to say you'll be switching off at wwf.org.uk/earthhour.

8.30pm 31 March 2012

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