Earth Hour is sort of like open source movement against global warming. On Saturday, March 28 at 8:30 P.M. (local time) millions of people in thousands of cities will turn off the lights for one hour to raise awareness about the link between global warming and energy use.



I think it's a great idea and I'm all up for doing it. 

If anybody else is game here's the official website.

http://www.earthhour.org/home/