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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.