Coastal perilWant to Avoid Climate-Related Disasters? Try Moving

By Peter Reuell

For those who lived through the storms, their names — Katrina, Sandy, Harvey, Michael — are enough to trigger memories of homes, businesses, and loved ones lost in rising floodwaters. Other disasters elicited similar reactions, from the Midwest floods to the California wildfires, and droughts in the Great Plains.

The eventual response to catastrophes tended to be a defiant vow to rebuild, turn loss into lesson by making protective seawalls higher and stronger to hold back floods, or raising homes onto stilts to stay clear of the encroaching waves.

To this, A.R. Siders says, “Enough.” The time has come to consider a different path: retreat. Abandon areas prone to repeated disaster in favor of those that are safer and do so in a deliberate, thoughtful way.

Known as “managed retreat,” Siders, an Environmental Fellow at the Harvard University Center for the Environment who recently joined the faculty of the University of Delaware, said the strategy has the potential to save not only lives, but possibly billions of dollars in direct and indirect costs to cities and towns. The idea is described in an Aug. 23 paper published in Science with co-authors Miyuki Hino and Katharine Mach.

“Traditionally speaking, there are three ways people respond to floods or hurricanes,” Siders said. “There is protection — basically building a sea wall. There’s accommodation, which often means homes that are elevated, or there’s retreat.

“We see retreat listed as an option as early as 2001 by the [Intergovernmenal Panel on Climate Change], but retreat has been seen as largely theoretical — somewhere, sometime people might have to move. But what we’re seeing more and more is that it might be here and that it might be now. It’s no longer a theoretical last resort. It’s something we should talk about now as a realistic option.”

The purpose of the paper, Siders said, is to call attention to the need for a greater focus on the strategy as a way to avoid the fallout seen from earlier disasters.

“The point we’re trying to make is: Retreat will happen; people will move. Not managing retreat doesn’t stop people from moving,” Siders said. “After Hurricane Katrina, people had their homes destroyed, and they moved with no help and no support. They just left.”

For the neighborhoods they leave behind, the results can be corrosive.

“You have thousands of empty homes, and the city has to figure out who owns them,” she said. “They have to sell or demolish them, and maintain the lots. So it eats away at the community, because it’s dotted with vacant homes, and it eats away at the city’s resources.

“But if you do manage it and try to do this in a strategic way, then you have a better chance of avoiding those harms,” she continued.

The notion of managed retreat, however, is about more than what happens to the homes people leave behind when they flee.

“It touches on so many aspects of a city,” Siders said. “You have to think about things like where people are going — where they’re choosing to go and where you want to provide incentives for them to go.

“What are the effects on the community they’re moving to? Do they have enough services? Do they have enough hospitals and schools to take in the people they’re receiving? For the people who stay behind, do they suddenly have no sense of community because of all these vacant lots, or do they have something like a new public park or feature to maintain a sense of community?”

Those questions only deepen, Siders said, when retreat crosses national and cultural borders.

Peter Reuell is a Harvard staff writer. This article is published courtesy of the Harvard Gazette, Harvard University’s official newspaper.