Hundreds of millions of people, businesses and governments around the world unite each year to support the largest environmental event in history – Earth Hour.

For Earth Hour 2011,more than 5,200 cities and towns in 135 countries around the world switched off their lights to send a powerful message for action on climate change. It also ushered in a new era with members going Beyond the Hour, as they commit to lasting action for the planet. Without a doubt, it’s shown how great things can be achieved when people come together for a common cause.

This year, Earth Hour 2012 will take place on 31 March, Saturday at 8.30 pm.