It may not sound like a classic Saturday night blow-out, but at 8 p.m. on March 29, millions of people around the world will turn off their lights to celebrate Earth Hour.
This event, sponsored by the WWF, a global conservation organization, is intended to increase awareness of global warming and spur action to combat the issue.
The movement began last year when the WWF asked residents of Sydney, Australia, to turn off their lights for an hour.
