Rising sea levels and disappearing ice caps have been a staple of science fiction futures ever since the first alarm bells were sounded that an ice-free earth was a possibility, no matter what culprit is left holding the smoking gun. (Though at this point, the science is long since in: climate change is happening, and the main cause is human activity.) We’ve seen these watery worlds depicted many times, particularly in film, with varying degrees of success—Waterworld springs immediately to mind. There’s such massive visual appeal to the image of once-great cities like New York inundated by the rising tides; skyscrapers become a new sort of submarine canyon for the divers of the future to explore.
And more recently, we’ve seen the US truncated from both directions by the Atlantic and Pacific in The Hunger Games. We don’t know a whole lot about what changed the shape of North America to give us Panem, other than the fact that the sea level rose to an unknown degree, and there was some sort of cataclysmic war.