The projections paint an unsettling picture of New York's future: A city where by the 2050s, 800,000 people could be living in a flood zone that would cover a quarter of the land, and there are as many 90-degree days as is now normal for Birmingham, Ala.

New York City Mayor Michael Bloomberg (Spencer Platt/Getty Images)

With those new projections of the effect of global warming, Mayor Michael Bloomberg is due to talk Tuesday about what to do about it.

The projections were released Monday. They come from a scientists' group convened by the city.

After Superstorm Sandy, Bloomberg told top aides to study how to make the city resilient to natural perils as the climate changes.

He said last winter the study would examine the pros and cons of building berms, dunes, levees and other coast-protection structures.

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