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Scenes from Earth Hour 2009

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The World Wildlife Fund's (WWF) Earth Hour is an annual global event held on the last Saturday of March, in which participants turn off non-essential electrical appliances for an hour in order to raise awareness on climate change. This picture provided by Commonwealth Edison shows buildings in downtown Chicago darkened during Earth Hour 2009 on Saturday, March 28, 2009. The Wrigley Building is seen at center.

PHOTO: Eric Y. Exit/Commonwealth Edison/AP

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