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Photo by: Richard Drew

Passengers view lower Manhattan from the Staten Island Ferry while crossing New York's Upper Bay on Tuesday, June 11, 2013. Giant removable floodwalls would be erected around lower Manhattan, and levees, gates and other defenses would be built elsewhere around the city under a nearly $20 billion plan proposed by Mayor Michael R. Bloomberg to protect the city from storms and the effects of global warming. (AP Photo/Richard Drew)

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