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Via the CityRoom, this is a map from the Union of Concerned Scientists that depicts what would happen to the city if we don't confront climate change. From page 2 of the report on New York (PDF):

Coastal flooding.

Rising sea levels caused by global warming are projected to increase the frequency and severity of damaging storm surges and flooding. Under the higher-emissions scenario what is now considered a once-in-a-century coastal flood in New York City is projected to occur at least twice as often by mid-century, and 10 times as often—once per decade on average—by late-century. With lower emissions, today’s 100-year flood is projected to occur once every 22 years on average by late-century.

The report also details the impact of higher emissions on human health, fisheries, agriculture, forests, and more.

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