"Created to take a stand against the greatest threat our planet has ever faced, Earth Hour uses the simple action of turning off the lights for one hour to deliver a powerful message about the need for action on global warming."
If you would like to participate in Earth Hour, on the 29th of March at 8pm turn off the lights in your house. Last year the event only took place in Sydney but the originators are hoping people around the world will participate together this year. Last time I checked in 12,301 people had committed to doing it. Check out the fun site here.