This Earth Hour 2012: 8.30pm, Saturday 31 March, celebrate your action for the planet with the people of world by switching off your lights for an hour, then go beyond the 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 2011 created history as the world's largest ever voluntary action with people, businesses and governments in 135 countries across every continent coming together to celebrate an unambiguous commitment to the one thing that unites us all -- the planet.