LONDON, ENGLAND - MARCH 31: The lights are turned off on The Houses of Parliament in central London, to mark 'Earth Hour' on March 31, 2012 in London, England. According to organisers the biggest ever Earth Hour has participants including individuals, companies and landmarks in 147 countries and over 5,000 cities, agreeing to switch off their lights for one hour at 8:30pm. The Brandenburg Gate in Berlin, the Eiffel Tower in Paris, Big Ben Clock Tower in London, the Christ the Redeemer statue in Rio de Janeiro and the Empire State Building in New York are among the monuments whose operators have agreed to participate in the demonstration. (Photo by Dan Kitwood/Getty Images)
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