(120401) -- MEXICO CITY, April 1, 2012 (Xinhua) -- A girl plays at the ceremony during the Earth Hour in Mexico City, on March 31, 2012. The Earth Hour, initiated by the World Wild Fund for Nature in 2007, calls on families and buildings to turn off the lights for one hour on the last Saturday night of March. (Xinhua/Guillermo Arias) (dtf)
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