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Earth Hour is the world’s largest demonstration of support for action on climate change. Each year, millions of people around the world come together to call for action to protect our brilliant planet.

The celebrations have grown each year, spreading round the world, with a record 178 countries taking part last year. Iconic landmarks across the UK switched out their lights, from Big Ben and Buckingham Palace, to Brighton Pier and Edinburgh Castle, joining the millions of Earth Hour celebrations. And this year is set to be the biggest yet as it’s the 10 year anniversary of Earth Hour.

To take part, just sign up to say that you will turn your lights off at 8.30pm on Saturday 25 March to support action on climate change.  If you would also like to hold an event during the hour (whether a candlelit dinner or a sponsored glow in the dark walk) we'd love to hear about it - just add it to your sign up form. There are loads of ideas and resources to help you make yours a truly memorable evening, just check out our useful resources page.

If you need help or support with planning your Earth Hour, or want to find out how you can help us take action on climate change, email the team at