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Bloomberg unveils $20B plan to handle climate change

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JENNIFER PELTZ, Associated Press

NEW YORK (AP) -- Mayor Michael Bloomberg is proposing removable flood walls for much of lower Manhattan, a permanent 15-to-20-foot levee in part of Staten Island and a system of gates and levees at a Brooklyn creek as part of a nearly $20 billion plan to protect New York City from storms and global warming.

 Bloomberg's proposals in a speech Tuesday also include building dunes in Staten Island and the Rockaways, and considering building a levee and a new development at the South Street Seaport that would echo nearby Battery Park City.

 He's also suggesting giving $1.2 billion in grants to property owners to flood-proof their buildings.

 The speech stems from a study undertaken after Superstorm Sandy.

 Bloomberg says the city and Sandy relief will provide $10 million for these projects.

"We have to look ahead and anticipate any and all future threats, not only from hurricanes and other coastal storms but also from droughts, heavy downpours and heat waves — many of which are likely to be longer and more intense in the years to come," an excerpt from the mayor's planned speech says.

Bloomberg said last winter the study would examine the pros and cons of building berms, dunes, levees and other coast-protection structures. But he has historically been cool to the idea of massive sea walls — and emphatic about not suggesting that people retreat from coastal communities.

The recommendations will draw from updated predictions from the New York City Panel on Climate Change, a scientists' group convened by the city.

The average day could be 4 degrees to nearly 7 degrees hotter by mid-century, the panel estimates in data Pinsky and Holloway discussed Monday. A once-in-a-century storm would likely spur a surge 5 or more feet higher than did Sandy, which sent a record 14-foot storm tide gushing into lower Manhattan.

And with local waters a foot to 2½ feet higher than they are today, 8 percent of the city's coastline could see flooding just from high tides, the group estimates. Most of that coast is in a relatively undeveloped area near a bay.

City Hall, the state government and others have released warnings over the years about climate risks. The city has required some new developments in flood zones to be elevated and has restored wetlands as natural barriers, among other steps.

"Sandy, obviously, increased the urgency of dealing with this and the need to plan and start to take concrete steps," Holloway said.

The new projections echo 2009 estimates from the climate change panel, but the timeframe for some upper-end possibilities has moved up from the 2080s to mid-century.

"The overall numbers are similar, but we have more compelling evidence now that (a more severe scenario from 2009) is looking like a more realistic possibility now," due to improved computer models and more evidence that some ice sheets are melting, said Radley Horton, a climate scientist with Columbia University's Earth Institute and a researcher with the city climate panel.

Scientists have reached a consensus on global warming but still debate how severe the effects will be.

Meanwhile, the Federal Emergency Management Agency released revisions Monday to proposed new flood zone maps for the city. About 218,000 people and 35,000 buildings are in the current once-in-100-year flood zone, drawn in the 1980s. The new maps roughly double those numbers, though the revision shifts about 5,800 structures from a subset called the V zone — the area expected to suffer the worst damage — to a less stringent zone.

A roughly two-year review is expected before new maps become official. They can affect building regulations and insurance.

___

Associated Press writer Meghan Barr contributed to this report.

Copyright 2013 The Associated Press.

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