About Earth Hour

Earth Hour is a global environmental movement that mobilizes hundreds of millions of people to make a difference for the planet. Its core vision is to create environmental impact by utilizing the power of the crowd.


Each year, every last Saturday of March, at 8.30pm (20:30) in local time, Earth Hour celebrates the symbolic “lights off” hour, which has grown from a one city initiative to a mass global event involving more than 178 countries and 7000 cities and towns. Iconic buildings and landmarks around the world such as Sydney Harbour Bridge, CN Tower in Toronto, Golden Gate Bridge in San Francisco, and Rome’s Colosseum, all stood in darkness for Earth Hour.