First ever UK Earth Hour Live on the night live streaming, featuring live switch offs from London and across the world, community events, and an exclusive McFly performance.
More landmarks across the UK signed up than ever before.
What people are doing in the dark
See who’s showing their support near you!
Check out our brilliant interactive map to see who signed up to join WWF’s Earth Hour 2013. You can zoom in to find out what happened across the country.