Earth Under Water – Worldwide Flooding | National Geographic (2010) Miami, New Orleans and New York City completely under water it’s a very real possibility if sea levels continue to rise. In Earth Under Water we’ll see these events unfold as leading experts forecast how mankind will be impacted if global warming continues. They’ll break down the science behind these predictions and explore ways humanity could adapt, including engineering vast dams near San Francisco, or building floating cities outside of New York.