Earth Hour is a worldwide movement for the planet organized by the World Wide Fund for Nature (WWF). The event is held worldwide annually encouraging individuals, communities, households and businesses to turn off their non-essential lights for one hour, from 8:30 to 9:30 p.m. on the last Saturday in March, as a symbol for their commitment to the planet. Earth Hour 2015 will be today Saturday, March 28, from 8:30 p.m. to 9:30 p.m. during participants' local time.
-- Read Suggestions for celebrating Earth Hour at School
-- Explore WWF - Schools for a Living Planet