Earth Hour: Turn off your Lights
At nights, most of Africa is dark, but wherever you are, if you use artificially generated light - join and turn off your lights for Earth Hour . Starting in New Zealand's remote Chatham Islands, thousands of cities, towns, and landmarks around the world will start to go dark for Earth Hour on Saturday evening. Up to a billion people worldwide are expected to participate in this global voluntary blackout by switching off their lights from 8:30 p.m. to 9:30 p.m. local time. The movement, sponsored by the conservation nonprofit WWF, is designed as a symbolic gesture in support of action against global warming . Read more from the National Geographic .