This hoverboard startup wants to create floating cities to combat climate change

As rising sea levels continue to threaten coastal communities around the world, a potential (and far-fetched) idea has emerged to protect houses and apartment buildings by floating them on pools of water like a boat. Arx Pax, the Silicon Valley startup behind the Hendo hoverboard, recently filed a patent for something it calls a self-adjusting floating environment, or SAFE Building System, that it plans to license to real estate developers, aid groups, and governments interested in creating clim