Earth hour is a worldwide movement organized by World wide Fund for nature. 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.Across 187 country Observance this Event.Sebabratee mukta Scout group also Observance Earth Hour.