Earth Hour began in 2007 in Sydney, Australia when 2.2 million homes and businesses turned their lights off for one hour to make their stand against climate change.
The following year, Earth Hour became a global sustainability movement with more than 50 million people across 35 countries participating.
In March 2009, hundreds of millions of people took part in the third Earth Hour. Over 4000 cities in 88 countries officially switched off to pledge their support for the planet, making Earth Hour 2009 the world’s largest global climate change initiative.
Why not participate in Earth Hour 2010 which takes place on Saturday 27 March at 8.30pm (local time) and is a global call to action to every individual, every business and every community throughout the world.
Join millions of other people across the world from all walks of life by turning off your lights and unite together in celebration and contemplation of the one thing we all have in common – our planet.
Help make 2010 the biggest Earth Hour yet!!!
Update: 30/3/2010 - Have a look at these wonderful photos of the event.