Earth Hour is a worldwide event that encourages individuals to unite in the fight against global warming by turning off their lights and spending sixty minutes outside with friends and family. Over the past two years the simple idea has grown into a monumental movement, and this year’s event is aiming for 1 billion participants. Earth hour 2009 takes place on March 28th at 8:30pm local time, so save the date, flip the switch, and see how this simple individual action can make a profound collective statement!

Organized by the World Wildlife Fund, this year’s Earth Hour is seeking to sign up 1,000 cities and one billion people to participate in the event. So far, they have signed up 1,189 cities across 80 countries. You can get more information of local events in your area by visiting their website. Those of you who follow us on Twitter may wish to follow them at Earthhour.