Will you accept this challenge?
Earth Hour is a worldwide event organized by the World Wide Fund for Nature ( WWF) and held towards the end of March annually. Hundreds of millions of people around the world turn off their lights for
one hour on the same night, to focus on the one thing that unites us
all our planet.
Earth Hour is a worldwide event organized by the World Wide Fund for Nature (
Earth Hour 2013 will be held across the world on Saturday, March 23 at 8:30 p.m. to 9:30 p.m.