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Earth Hour is an annual international event created by the WWF (World Wide Fund for Nature/World Wildlife Fund), held on the last Saturday of March, that asks households and businesses to turn off their non-essential lights and electrical appliances for one hour to raise awareness towards the need to take action on climate change. Based on an idea successfully executed in Thailand in , it was pioneered by WWF Australia and the Sydney Morning Herald in 20, and achieved worldwide participation in 2008.Earth Hour will next take place on Saturday, March 28, 2009 at 8:30 pm, local time.