The Earth Hour 2011: 8.30pm, Saturday 26 March: Earth Hour 2011 Official video

This Earth Hour 2011: 8.30pm, Saturday 26 March, celebrate your action for the planet with the people of world, and add more to your Earth Hour.

From its inception as a single-city initiative -- Sydney, Australia - in 2007, Earth Hour has grown into a global symbol of hope and movement for change. Earth Hour 2010 created history as the world's largest ever voluntary action with people, businesses and governments in 128 countries across every continent coming together to celebrate an unambiguous commitment to the one thing that unites us all -- the planet.

Sign up to earthhour.org, switch off your lights for Earth Hour 2011, and share the positive actions you will sustain for earth beyond the hour.