Use your power to change climate change.

Uniting people to protect the planet.

The Lights-Off Event

Earth Hour started in 2007 as a lights-off event to raise awareness about climate change. We have grown to engage more than 162 countries and territories worldwide. Earth Hour is on Saturday, 28 March 2015 at 8:30 pm local time.

Learn more about us

Watch the Impact

Earth Hour 2014 was the biggest yet, thanks to you. From driving legislation change to launching our first crowdfunding platform and celebrations for the planet across the world. Share the video now to help spread the word!

Learn more about our impact

Watch our powerful new video

Everyone's talking climate change. Join the conversation! 

Join the movement

Take your first step towards changing climate change. Join millions of people across the world who are part of the Earth Hour movement.


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