Presented by a group of designers, architects and engineers at a United Nations roundtable last week, this floating city could be the future of sustainable (and affordable) living. Built in a lilypad-like array of hexagonal platforms, nearly 10,000 citizens could live in this sea-based city, which would float—but also be moored to the ocean floor—just a mile off the coastline. The citizens would also, in theory, grow fresh produce above and below water. In the instance of emergencies or sudden scarcities, they would also be able to harvest water from the air using a condensing technology. Plus, the city would strive to ban high-emitting vehicles—and eventually vehicles altogether. The city can be unhinged and towed away during natural disasters—and withstand earthquakes and hurricanes. Read more at Business Insider.