At 8:30pm on Saturday, 27 March, lights will go out in homes, office buildings, town halls and public spaces across the globe – from the world’s tallest building in Dubai, to San Francisco’s Golden Gate Bridge… and in YOUR living room!

Switch off your lights for one hour. That is all it takes for you to partipate along with millions of people in the single largest mass statement on climate change and be part of WWF’s Earth Hour.

Earth Hour is more than just turning off the lights for one hour once a year. When we do this together, when whole cities go dark, we send a strong message to our leaders about the threats of global warming and that we can work together to create a sustainable future for our planet.

Last year, 4,000 cities in 88 countries took part in the international celebration of darkness. This year you can help make it even bigger.

Join the movement