About Earth Hour
We're doing it to tackle climate change
WWF believes there is still time to avoid the worst impacts of climate change. But we need to act now.
Watch our short video about WWF and climate change
Earth Hour UK 2011 sign-up challenge
Whether you’re in Kent or Cumbria, Lancashire or Lanarkshire, Antrim or Anglesey… see how high your part of the UK can get on our interactive 3D sign-up map.
Earth Hour 2010 was a night to remember!
Be inspired by Earth Hour 2010! See images of WWF's Earth Hour as it spread across the world in over 125 countries and more than 3,400 towns and cities.
See the pictures
All about Earth Hour 2010
On Saturday 27 March 2010 at 8.30pm, millions of people around the world switched off their lights for one hour – WWF’s Earth Hour.
Watch our short films and find out more about WWF's Earth Hour.
Tell your friends about Earth Hour:
