Hong Kong Earth Hour

This combination of two photos showing commercial buildings before, top, and after, bottom, turning off lights at Hong Kong's central district Saturday, March 31, 2012, marking the annual Earth Hour. Earth Hour takes place worldwide at 8.30 p.m. local time and is a global call to turn off lights for 60 minutes in a bid to highlight the global climate change. (AP Photo/Kin Cheung)

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