The World Wildlife Fund (WWF) environmentalists around the world to turn off non-essential lights for one hour from 8.30 pm to 9.30 pm on 19 March 2016. Last years, 7,000 cities in 172 countries supported the initiative.

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The World Wildlife Fund (WWF) environmentalists around the world to turn off non-essential lights for one hour from 8.30 pm to 9.30 pm on 19 March 2016. Last years, 7,000 cities in 172 countries supported the initiative.