For the moment, let’s leave aside the larger debate about how much the water actually will rise. Zillow’s worst-case scenario is based on a study The Washington Post wrote about earlier this year, in which scientists projected that sea levels could be six feet higher by the end of this century — nearly twice as much as previously predicted — if carbon dioxide emissions continue unabated. Sharp cuts in greenhouse gas emissions in coming decades could lessen the impact, however, leaving the increase closer to two feet. And constructed barriers and flood-prevention efforts would help minimize the risk in some areas.

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Yet there’s near-unanimous agreement among scientists that the seas will rise. Insurance companies are anticipating it. Some cities are already planning for it.

“This is going to be a massive issue worldwide,” Michael Gerrard of Columbia University, who directs the Sabin Center for Climate Change Law, told The Post in a recent interview. “We don’t know yet the exact pace, but we know it’s coming. A certain amount is unavoidable.”

Back to the Zillow report. The company used maps released by the National Oceanic and Atmospheric Administration to determine what coastal areas would be inundated. The firm then used its nationwide database to determine which properties were most at risk of being flooded — at least on the ground level — by the next century.

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The results are grim. With six feet of sea level rise, nearly 2 percent of all U.S. housing stock could vanish, accounting for roughly $882 billion worth of homes.

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“Based on our calculations, it may turn out that actual water poses almost as much of a problem for the housing market in the future as negative equity has in the past,” wrote Krishna Rao, Zillow’s director of economic product and research.

Here are a list of the states that stand to lose the most homes, should seas indeed rise by six feet by 2100:

And here is how encroaching seas would affect a handful of specific cities, according to Zillow.

Miami could lose nearly a third of its housing stock, though Miami Beach already is spending hundreds of millions of dollars to install pumps and raise sea walls and roads in a bid to stave off encroaching water:

In Boston, nearly one in five homes could be at risk unless more protections are put in place:

While on the other side of the country, a quarter of the housing stock in Honolulu could be history:

You get the point. While scientists will continue to quibble over the degree of change and problems, most agree that both will only grow over time. Benjamin Strauss, director of the program on sea-level rise at Climate Central, an independent organization of scientists based in New Jersey, said that means now is the time for nations to aggressively cut their carbon emissions and explore plans to protect waterfront communities.

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“If we don’t do something,” he said, “we’re paving the way for a lot of hurt in the future.”

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