Photo: Earth Hour 2009: A Billion to Go Dark Saturday?



Seen from Toronto's CN Tower, high-rise buildings begin to turn off their lights for Earth Hour on March 29, 2008.

In March 2009 thousands of cities, towns, and landmarks around the world will again go dark for an hour in a symbolic gesture to support action against global warming.

Photograph by J.P. Moczulski/The Canadian Press/AP


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