Are floating cities the answer to sea level rise?

Thanks to climate change, sea levels are lapping up against coastal cities and communities. In an ideal world, efforts would have already been made to slow or stop the impact. The reality is that climate mitigation remains difficult, and the 40% of humanity living within 60 miles of a coast will eventually need to adapt.
One option is to move inland. A less obvious option is to move offshore, onto a floating city.
It sounds like a fantasy, but it could real, later if not sooner. Last year, Busan, South Korea’s second-largest city, signed on to host a prototype for the world’s first floating city. In April, Oceanix Inc, the company leading the project, unveiled a blueprint.
Representatives of SAMOO Architects & Engineers Co, one of the floating city’s designers and a subsidiary of the gigantic Samsung Electronics Co, estimate that construction could start in a “year or two,” though they concede the schedule might be aggressive. “It’s inevitable,” Itai Madamombe, co-founder of Oceanix, told me over tea in Busan. “We will get to a point one day where a lot of people are living on water.”
If she’s right, the suite of technologies being developed for Oceanix Busan, as the floating city is known, will serve as the foundation for an entirely new and sustainable industry devoted to coastal climate adaptation. Busan, one of the world’s great maritime hubs, is betting she’s right.
Humans have dreamed of floating cities for millenniums. Plato wrote of Atlantis; Kevin Costner made Waterworld. In the real world, efforts to build on water date back centuries.
The Uru people in Peru have long built and lived upon floating islands in Lake Titicaca. In Amsterdam, a city in which houseboats have a centuries-long presence, a handful of sustainably minded residents live on Schoonschip, a small floating neighbourhood, completed in 2020.
Madamombe began thinking about floating cities after she left her role as a senior adviser to then-UN Secretary General Ban Ki-Moon. The New York-based native of Zimbabwe had worked in a variety of UN roles over more than a decade, including a senior position overseeing partnerships to advance the UN’s Sustainable Development Goals. After leaving, she maintained a strong interest in climate change and the risks of sea-level rise.
Her co-founder at Oceanix, Marc Collins, an engineer and former tourism minister for French Polynesia, had been looking at floating infrastructure to mitigate sea-level risks for coastal areas like Tahiti. An autonomous floating-city industry seemed like a good way to tackle those issues. Oceanix was founded in 2018. Busan, home of the world’s sixth-busiest port, and a global logistics and shipbuilding hub, quickly emerged as a logical partner and location for the city.

—Bloomberg