World's Population Hits 7 Billion Mark

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A crowd of people cross the street in midtown Manhattan on October... News PhotoCrowd,Environmental Issues,Global,Horizontal,Manhattan - New York City,Midtown Manhattan,New York City,People,Population Explosion,Street,USAPhotographer Collection: Getty Images News 2011 Getty ImagesNEW YORK, NY - OCTOBER 31: A crowd of people cross the street in midtown Manhattan on October 31, 2011 in New York City. Around the world countries marked the global population reaching seven billion Monday. The UN is using Monday to symbolically mark the day as demographers are not sure exactly when the world's population will reach the seven billion mark. (Photo by Spencer Platt/Getty Images)