Earth Hour

Mark your calendars for March 28, 8:30pm for earth hour.
http://www.earthhourus.org/main.php
Here is information directly from their web site:
1. What is Earth Hour?
Earth Hour is World Wildlife Fund's global initiative where individuals, businesses and governments turn off their lights for one hour to show their support for action on climate change.
Earth Hour is a symbolic event designed to engage people from all walks of life in the climate change discussion to send a strong message to our political leaders that we want them to take meaningful action on climate change.
The largest climate event in history where millions of people around the world will unite by turning off their lights for one hour, Earth Hour, to demand action on the climate crisis.
2. When is Earth Hour?
Earth Hour 2009 takes place on Saturday, March 28, 2009 at 8:30 pm–local time.
Just like New Years Eve, Earth Hour will travel from time zone to time zone starting at 8:30pm in New Zealand.

I know this is not the first time they have done it. I am trying to find out how many years they have done this. I know for sure 2008 and probably 2007 but I'm not sure how much more than that. Check it out!