<Table> <Tr> <Td> </Td> <Td> This article contains content that is written like an advertisement . Please help improve it by removing promotional content and inappropriate external links, and by adding encyclopedic content written from a neutral point of view . (March 2016) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article contains content that is written like an advertisement . Please help improve it by removing promotional content and inappropriate external links, and by adding encyclopedic content written from a neutral point of view . (March 2016) (Learn how and when to remove this template message) </Td> </Tr> <P> Earth Hour is a worldwide movement organized by the World Wide Fund for Nature (WWF). The event is held annually encouraging individuals, communities, and businesses to turn off non-essential electric lights for one hour, from 8: 30 to 9: 30 p.m. on a specific day towards the end of March, as a symbol of commitment to the planet . It was started as a lights - off event in Sydney, Australia, in 2007 . Since then, it has grown to engage more than 7,000 cities and towns across 172 countries . </P> <P> Earth Hour 2016 was on Saturday, March 19, from 8: 30 p.m. to 9: 30 p.m. during participants' local time . and was held March 25 in 2017 . </P>

What is the aim of celebrating earth hour