Started by WWF and partners as a symbolic lights-out event in Sydney in 2007, Earth Hour is now one of the world's largest grassroots movements for the environment. Held every year on the last Saturday of March, Earth Hour engages millions of people in more than 180 countries and territories, switching off their lights to show support for our planet.
But Earth Hour goes far beyond the symbolic action of switching off - it has become a catalyst for positive environmental impact, driving major legislative changes by harnessing the power of the people and collective action.
Earth Hour is open-source and we welcome everyone, anyone, to take part and help amplify our mission to unite people to protect our planet.
Our mission: Then and now
In 2007, we encouraged people around the world to switch off their lights to call attention to climate change. More than a decade later, the climate crisis remains, made worse by another urgent threat: the rapid loss of biodiversity and nature.
Today, Earth Hour aims to spark global conversations on protecting nature not only to combat the climate crisis, but to ensure our own health, happiness, prosperity and even survival.
2021: The year that counts
2021 presents an unmissable opportunity. In 2021, world leaders will come together during key global conferences and forums to set the environmental agenda for the next decade and beyond. Crucial political decisions will be made on climate action, nature, and sustainable development –- decisions that will directly affect the fate of humanity and our planet for years to come.
With your support, Earth Hour 2021 could be a spotlight moment that puts nature at the center of international conversations. Together, we can speak up and show world leaders and other decision-makers around the globe that nature matters and urgent action must be taken to reverse nature loss.
Every year, we countdown together across the globe to celebrate Earth Hour and take one iconic action: switch off the lights.
But it is so much more than that. It is a symbol of unity. It is a symbol of hope. It is a symbol of power in collective action for nature.