Niaqornet, Greenland Deep inside the Arctic Circle, the picturesque village of Niaqornet, Greenland, population 59. Dubbed “The Village at the End of the World,” Niaqornet is a tight-knit community but its very existence is under threat. Should the population dip below 50, the village will no longer be able to sustain itself and the remaining residents will be forced to leave. As the world’s population continues to shift away from rural areas and into urban centers, more far-flung communities like Niaqornet may disappear in the coming decades. Miami, Florida It’s no secret that climate change is causing the world’s seas to rise, posing a threat to numerous low-lying cities around the world. Sadly, one of those places is Miami, Florida, which, according to scientists, could be underwater as soon as 2030. Much of the city is no more than 5 feet above sea level already, so you might want to visit Miami now and soak up some sun while you can. Kivalina, Alaska It’s not just the warm, tropical side of the country we need to worry about; up north, global warming is also causing major problems. The fly-in community of Kivalina, Alaska has been branded a “dangerous” place to live by the United States government. The 400 current residents are sticking it out for now, but as temperatures rise, the ice barrier surrounding Kivalina gets thinner and thinner, making it susceptible to massive waves that could potentially wash the town away. Naples, Italy Experts warn that the sleeping volcano known as Mount Vesuvius that famously buried the ancient town of Pompeii a thousand years ago is likely to erupt again someday. This would destroy the nearby modern city of Naples, Italy, displacing over half a million people living in the surrounding area. The Italian civil protection agency has devised an evacuation plan, but let’s hope it’s never needed and that the people and rich history of the area are spared. Detroit, Michigan While Detroit isn’t likely to stop existing any time soon, it might not look much like the Motor City you remember. The collapse of the auto industry, the poor economy and the promise of a better life in the suburbs forced nearly a million people to move away in recent years, leaving behind what some are calling a “ghost town.” Revitalization isn’t impossible, but it might take some creative thinking. Make it a tax shelter? Give it to Canada? The possibilities are endless. Banjul, Gambia The president of Gambia famously said that the world is doomed thanks to gay people. Maybe before he worries about the world’s problems, he should focus on his own; the capital of Gambia is a city called Banjul, and according to scientists, it can be added to the list of places that will one day be underwater. The Great Barrier Reef, Australia It’s been estimated that you only have twenty years left to visit Australia’s famed Great Barrier Reef before it disappears completely — if mankind doesn’t intervene now, that is. The reef is home to a number of marine animals and organisms, but it is sensitive to the rising temperature and likely will not be able to adapt to even a 2-degree increase, experts say. San Francisco, California Over 100 years ago, the great bay city of San Francisco was nearly destroyed by an earthquake and the fires that followed. Modern experts estimate that it was around an 8.25 on the Richter scale and warn that another one like it could very well be coming. Built on the San Andreas Fault that slips every 140-150 years or so, San Fran could be on the verge of another great quake that could cause up to $200 billion dollars in damage. That estimate does not include the cost of the Full House house, which is irreplaceable.