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March 22, 2013 6:20 PM

Earth Hour 2013 is 8:30 p.m. Saturday, March 23

Earth Hour 2013 begins at 8:30 p.m. March 23 in your local time zone. Unfamiliar with the concept? The effort urges people around the world to turn off their lights for an hour to show concern for the environment. This is the seventh year of the campaign.

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