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SAFETY4SEA

13 million people in US could relocate from sea level rise, new study finds

by The Editorial Team
January 23, 2020
in Green Shipping, Sustainability
sea level rise
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Climate change-driven sea level rise could force about 13 million people, in the US alone, to relocate to inland cities by 2100, spurring more competition for jobs, increased housing prices, and more pressure on infrastructure networks, a new study by the University of South California has found.

The study, led by USC Computer Science Assistant Professor Bistra Dilkina, is the first to use machine learning to project migration patterns resulting from sea-level rise.

The researchers found the impact of rising oceans will ripple across the country, beyond coastal areas at risk of flooding, as affected people move inland.

When Hurricane Harvey slammed into the Texas coast in 2017, displaced residents flocked inland, trying to rebuild their lives in the disaster’s aftermath. Within decades, the same thing could happen at a much larger scale due to rising sea levels,

…the study finds.

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In the US alone, 13 million people could be forced to relocate due to rising sea levels by 2100, grappling cities throughout the country with new populations.

In addition, effects could include more competition for jobs, increased housing prices, and more pressure on infrastructure networks.

We hope this research will empower urban planners and local decision-makers to prepare to accept populations displaced by sea-level rise. Our findings indicate that everybody should care about sea-level rise, whether they live on the coast or not. This is a global impact issue,

…said Dilkina, the study’s corresponding author, a WiSE Gabilan Assistant Professor in computer science at USC and associate director of USC’s Center for AI for Society.

According to the research team, most popular relocation choices will include land-locked cities such as Atlanta, Houston, Dallas, Denver and Las Vegas.

The model also predicts suburban and rural areas in the Midwest will experience disproportionately large influx of people relative to their smaller local populations.

Sea-level rise is caused primarily by two factors related to global warming:

  • added water from melting ice sheets and
  • glaciers and the expansion of sea water as it warms.

Within just a few decades, hundreds of thousands homes on the US coast will be flooded.

In fact, by the end of the century, 6 feet of ocean-level rise would redraw the coastline of  southern Florida, parts of North Carolina and Virginia and most of Boston and New Orleans.

Moreover, based on migration patterns after Hurricane Katrina and Hurricane Rita, the team trained machine learning models—a subset of artificial intelligence—to predict where people would relocate.

As expected, inland areas immediately adjacent to the coast, as well as urban areas in the southeast US, will be affected the most.

But their model also showed more incoming migrants to Houston and Dallas than previous studies, which flagged Austin as the top destination for climate migrants from the southeastern coast.

This result, notes the researchers, shows that population movement under climate change will not necessarily follow previously established patterns.

Sea-level rise could also reroute people relocating from unaffected areas.

Counties surrounding Los Angeles, in particular, could see tens of thousands of migrants whose preferred coastal destinations are now flooded choosing alternative destinations.

The results of this study could help city planners and policymakers plan to expand critical infrastructure, from roads to medical services, to ensure the influx of people has a positive impact on local economies and social well-being.

When migration is forced upon people, productivity falls and human and social capital are lost as communities are broken apart. Understanding these migration decisions helps economies and policy makers prepare for what is to come and do as much as possible to make the influx of migration a positive experience that generates positive outcomes,

…said co-author Juan Moreno Cruz, an economist and professor at the University of Waterloo.

The study was published in PLOS ONE, on 22 January.

 

See also:

  • Study surveys people vulnerable to sea level rise
  • Ports to face challenging calculations due to rising sea-levels
13 million people in US could relocate from sea level rise, new study finds13 million people in US could relocate from sea level rise, new study finds
13 million people in US could relocate from sea level rise, new study finds13 million people in US could relocate from sea level rise, new study finds
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