This year marks the tenth Earth Hour - the world’s biggest environmental event. Hundreds of millions of people in countries and territories around the world will show they care about our planet by switching their lights off at 8.30pm for one hour.
What is Earth Hour?
Earth Hour is the world's largest grassroots movement for the environment, organised by WWF.
The event first started Sydney in 2007, in an attempt to put climate change in the spotlight.
It is now celebrated across all continents, and has helped bridge the gap between the grassroots and the corridors of power, taking climate action from conference rooms to living rooms.
When is Earth Hour?
Earth Hour 2017 will take place on Saturday 25 March at 8:30pm local time, when millions of people in over 170 countries across the world will switch off their lights for one hour to show they care about the future of our planet.
Why do people turn the lights off?
Earth Hour is not about how much energy is saved during the hour, but about putting the spotlight on the issues facing the planet and inspiring people to live more sustainably.
The idea is that the choices people make and the actions they take after the hour is up can help reduce the impacts of climate change on the planet, its wildlife and future generations.
Together we can make a difference: Your commitment to the planet helps to create far-reaching environmental and social impact. You can celebrate Earth Hour in any way you want. It's entirely in your hands.
Want to keep it simple? You could host a candle-lit dinner, go stargazing, or simply switch off your lights for an hour. Thinking of going a little bigger? You could put on a gig or concert, screen a movie, or host an Earth Hour party! The possibilities are endless.