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New York City is sinking by up to four millimetres a year under the 
 of all its 
. The United States Geological Survey calculated New York has around 1,080,000 buildings. They weigh around 764 billion kilograms. There is 
 weight from 
, the transport 
, and the weight of the city's 8.5 million 
. Dr Tom Parsons said the 
 sinking and rising sea 
 could make New York prone to natural disasters. He said new high-rise buildings could increase flood 
, especially along 
 and rivers.