The weekly Health Quiz - October 15, 2010 How much…
Before and After: Earth Hour
In honor of the fifth annual Earth Hour, millions of homes and businesses around the world went dark for one hour Saturday at 8:30 p.m. The symbolic gesture highlights concerns over climate change and is sponsored by the World Wildlife Fund.
Click and drag the slider at the bottom of the image to compare photos before and after the start of Earth Hour.
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