Earth Hour calls on individuals, businesses, communities and governments to go beyond the hour by accepting or creating an I Will If You Will challenge to inspire positive actions, both big and small, that change the world we live in.

From its inception as a single-city initiative – Sydney, Australia - in 2007, Earth Hour has grown into a global movement for change taking place in more than 7000 cities and towns across 152 countries and territories.

This Earth Hour 2013 will take place at 8.30pm on Saturday March 23 so make sure you switch off you lights!

You can join the global community by signing up to earthhour.org and take part in the I Will If You Will campaign to inspire the actions you want to see in the world.