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Millions of people around the world switch off their lights for an hour to mark Earth Hour on the last Saturday of March each year
Education

Earth Hour 2013: Switch off your light for one hour on March 23

James J. Williams -
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Earth Hour 2012 will take place on March 31, 2012 from 8.30 p.m. to 9.30 p.m., at participant's local time
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Earth Hour 2012: turn off your non-essential lights from 20.30 to 21.30 and save the planet

Sonia Pantiss -
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