As the largest environmental event in history, Earth Hour launched its 2012 campaign 'I Will If You Will' to showcase how everyone has the power to change the world they live in.

For the first time, Earth Hour, being held on 31 March, is taking a giant leap from its annual lights out event to offer a further opportunity for its communities to be part of the world's environmental solution.

Earth Hour began as a one city initiative in 2007, and has since grown to be a 5, 251 city strong global movement, reaching 1.8 billion people in 135 countries across all seven continents.

Earth Hour 2012 will take place at 8.30pm – 9.30pm on Saturday 31 March

Logo Credit:  Earth Hour – www.earthhour.org