What is Earth Hour?

Earth Hour is a global grass-roots movement encouraging individuals, businesses and governments around the world to take positive actions for the environment, and celebrating their commitment to the planet by switching off their lights for one designated hour.

Earth Hour 2011 will take place on Saturday 26 March at 8.30PM (local time). This Earth Hour we want you to go beyond the hour, so after the lights go back on think about what else you can do to make a difference. 

Source: http://www.earthhour.org/About.aspx and http://www.earthhour.org/FAQ.aspx

For more details feel free to visit http://www.earthhour.org

Lets do something together for our beloved Mother Earth :)