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Cities try to go dark for Earth Hour

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The Sydney Opera House before and after it went dark for the inaugural Earth Hour in Australia last March. (Photo by Grant Turner/Fairfax Photos; Courtesy of WWF Australia)

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Sydney's Harbour Bridge after the lights went off for Earth Hour on March 31, 2007. (Photo by Michael Bowers/Fairfax Photos; Courtesy of WWF Australia)

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The Sydney Harbour Bridge glittering brightly before lights out for Earth Hour in March 2007 (Photo by Michael Bowers/Fairfax Photos; Courtesy of WWF Australia)

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After 2 million people in Sydney, Australia, turned out their lights for Earth Hour last year, a handful of cities across the U.S. and Canada have committed to be part of a global one-hour lights-out exercise on March 29. But for facilities managers and engineers preparing for the event, the task isn't as simple as flicking a switch.


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