Earth Hour!

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Director of Climate Policy at the World Wildlife Fund, Keya Chatterjee joins Mike to discuss Earth Hour. Saturday at 8:30 p.m. everyone who wants to participate will turn their lights off.

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The Wrigley Building with its essential lights turned off Saturday, March 28 2009. Chicago participated in Earth Hour when more than 200 downtown buildings turned off their non-essential lights for one hour as part of a global campaign against climate change. (Candice C. Cusic / Chicago Tribune)