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FILE — Waves wash over the seawall near high tide at Battery Park in New York, Oct. 29, 2012, as Hurricane Sandy approaches the East Coast. If rising oceans aren't worry enough, add this to the risks New York City faces: The metropolis is sinking under the weight of its skyscrapers, apartment buildings, asphalt and humanity itself — and will eventually become flooded by the Hudson River and Atlantic Ocean. (AP Photo/Craig Ruttle, File)More than 1 million buildings are spread across the city's five boroughs. The research team calculated that all those structures add up to about 1.7 trillion tons (1.5 trillion metric tons) of concrete, metal and glass — about the mass of 4,700 Empire State buildings — pressing down on the Earth.
Originally published at The Associated Press