Topic: Earth Hour Pictures: Before and After, 2009

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The voluntary, annual global blackout, which aims to ease global warming, began in Sydney in 2007 with the nonprofit WWF. In 2009, 2,712 cities, towns, and municipalities in 83 countries signed up to participate in Earth Hour. The movement is a symbolic gesture in support of action against global warming

http://news.nationalgeographic.com/news/2009/03/photogalleries/earth-hour-2009-pictures/?now=2010-03-23-00:01#rome-before-earthhour_4718_600x450.jpg