On March 29th, 2008, people around the globe will have to turn their lights off for Earth Hour 08. This is about turning your lights off for an hour. Other people are planning to do the same thing. Not just the people around you, but worldwide. Mainly because of global warming. And this is not a joke. You have to have their support too. By 9:00 (on your local time) you can turn your lights back on.
You may be wondering what would you want to do while this happens? You could just go to bed early, read a book with a standard candle for lighting, or something else.