Historically, skyscrapers have turned off their lights at night in response to special circumstances. For example, in 2004 many Chicago skyscrapers turned off their lights at night in order to facilitate nocturnal birds’ migration through the city. In September and October 2008, many Boston skyscrapers turned off their lights at night to both reduce their energy use and, like Chicago, protect birds that were migrating through the city. And in March 2009, many Chinese skyscrapers turned off their lights for an hour one night in a move entitled “Earth Hour”.
Additional citation: http://wbztv.com/local/lights.out.boston.2.809019.html
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