Miami, 7020

In 2013, National Geographic reported that it would take around 5,000 years for all of the ice in the world to melt. This is based on the rate of melting we have experienced in the last couple decades. While the sea level would rise considerably, putting many coastal cities underwater, the rise of global temperature that would cause this massive melt would ultimately be the greatest concern for humans.  The average temperature of the planet is projected to be 26.6 degrees Celsius, almost double the 14.4 degrees Celsius average temperature the Earth currently holds.

In 7020, the great city of Miami will be completely underwater. It will hardly take 5,000 years, but as little as 80, according to The Intergovernmental Panel on Climate Change. This is due to the projected sea level rise of 6 feet by 2100. The average elevation in Miami is 6 feet. 

Sea levels rise is caused by rising global temperatures, which is accelerated by carbon output. It is safe to assume that even if we decrease carbon output significantly, the natural cycles of the earth will cause a rise in global temperatures enough to capside Miami by 7020. 

Global Warming is happening now, and will continue to happen unless there's a drastic change in environmental policy, not just stateside but worldwide, especially China. I mention China, because they lead the world in carbon emissions, producing 29% of the world's CO2 emissions, and have done even less than the United States to taper it. 

By 7020, Miami will be an example of not only Global Warming, but a product of Earth's cycles. Not only will Miami be underwater, but they will practically be in the open ocean, with the closest coastline 500 miles away in Charleston. In the coming centuries, Miami may survive by converting to a floating city, with little ground to stand on, but that will just delay the inevitable demise of the city.