In this Tuesday, June 11, 2013, photo, lower Manhattan is visible from 

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