Lori Rittel is stuck in her Florida Keys home, living in the wreckage left by Hurricane Irma two years ago, unable to rebuild or repair. Now her best hope for escape is to sell the little white bungalow to the government to knock down.

Her bedroom is still a no-go zone so she sleeps in the living room with her cat and three dogs. She just installed a sink in the bathroom, which is missing a wall, so she can wash her dishes inside the house now. Weather reports make her nervous. “I just want to sell this piece of junk and get the hell out,” she said. “I don’t want to start over. But this will happen again.”

The Great Climate Retreat is beginning with tiny steps, like taxpayer buyouts for homeowners in flood-prone areas from Staten Island, New York, to Houston and New Orleans — and now Rittel’s Marathon Key. Florida is the state with the most people and real estate at risk, is just starting to buy homes, wrecked or not, and bulldoze them to clear a path for swelling seas before whole neighborhoods get wiped off the map.

By the end of the century, 13 million Americans will need to move just because of rising sea levels, at a cost of $1 million each, according to Florida State University demographer Mathew Haeur, who studies climate migration. Even in a “managed retreat,” coordinated and funded at the federal level, the economic disruption could resemble the housing crash of 2008.

The U.S. government’s philosophy has been that local officials are in the best position to decide what needs to be done. Consequently, the effort has so far been ad hoc, with local and state governments using federal grants from the last disaster to pay for buyouts designed to reduce the damage from the next one.

“The scale of this is almost unfathomable,” said Billy Fleming, a landscape architecture professor at the University of Pennsylvania. “If we take any of the climate science seriously, we’re down to the last 10 to 12 years to mobilize the full force of the government and move on managed retreat. If we don’t, it won’t matter, because much of America will be underwater or on fire.”

If not for the $174,000 that Rittel, 60, owes on her mortgage, the Montana transplant would have left long ago. Insurance money is insufficient to rebuild, so she applied for one of the buyouts, administered by the state with $75 million of Irma-relief cash from the U.S. Department of Housing and Urban Development, as long as it lasts.

Florida accounts for 40% of the riskiest coastal land in the U.S., according to the Union of Concerned Scientists, but it’s done little so far to pull people back from the coasts and lags behind states such as New Jersey, North Carolina and Texas. Across the country, the effort is still more theory than practice, even as a consensus among planners grows that “managed retreat” may be the best of bad options.

This year, HUD made available $16 billion for climate resilience, its first dedicated fund to fortify for future storms. Nine states, plus Puerto Rico and the Virgin Islands, will decide how to use it, whether to build sea walls, put houses on stilts or move people out of the way. The money is a fraction of what’s needed, and the process is moving at the speed of government.

A study by the National Resources Defense Council this month found that buyouts by the Federal Emergency Management Agency, which responds to disasters, take five years on average to be completed. By that time, many homeowners have rebuilt or moved. Similar data isn’t available on the grants from HUD, which also provides money to demolish homes.

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