Earth Hour takes place Saturday between 8.30pm and 9.30pm

Earth Hour gives a powerful voice to people everywhere who want to put the world on the path to recovery. Each year, millions of people around the world switch off their lights and organise events - at home, in their community or in their towns or cities - to show they care about the future of our planet.

Last year over 10 million people across the UK took part to send a clear message: we're fighting for our world. From the Sydney Opera House and the Empire State Building to Buckingham Palace and Edinburgh Castle, communities like yours switched out their lights in a symbolic show of support.