Earth Hour is a worldwide movement for the planet organized by the World Wide Fund for Nature the W.W.F. .. the event was famously started as a lights off event in Sydney, Australia in 2007 and engages a massive mainstream community on a broad range of environmental issues .. since then it has grown to include more than 7000 cities and towns worldwide, and the one hour event continues to remain the key driver of the now larger movement .. earth hour is held worldwide and towards the end of march every year, encouraging individuals, communities, households and businesses to turn off their non essential lights for one hour as a symbol for their commitment to the planet..