Earth Hour 2013, 8:30 PM Saturday 23 March. Earth Hour has grown from a one-city initiative in 2007 to the world’s largest campaign for the planet, uniting hundreds of millions of people across 7001 cities and towns in 152 countries and territories.

The official 2013 video features the track “Without You” by David Guetta and Usher, providing an upbeat soundtrack to match the celebration of this year’s event across the world. Earth Hour’s mission is to unite people to protect the planet, so go beyond the hour and upload your I Will If You Will challenge to www.YouTube.com/EarthHour. Dare the World to Save the Planet.