It all started with a question: How can we inspire people to take action on climate change? The answer: Ask the people of Sydney Australia to turn off their lights for one hour. In 2007, an estimated two million Sydney residents turned out their lights for one hour - Earth Hour. In 2008, 371 cities in 35 countries joined the show and the number of participants leapfrogged to around 53 million. This year on Saturday (March 28, 2009), some 2848 cities, towns and municipalities in more than 84 countries have signed on and promoters are hoping it will attract close to a billion people. (source: EarthHour.org) 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 climate change.