Miami will be threatened by rising sea levels over the next few centuries. On that there’s pretty much scientific consensus. The only question is exactly how big the threat.
Well, a new study published in the Proceedings of the National Academy of Sciences of the United States of America predicts that our choices are either completely underwater or with some area left high and (relatively) dry. Which means even under the best-case scenario, Miami will stop looking like mainland Florida and start looking more like a string of Islands that are essentially the new northern end of the Florida Keys.
The study looked at our future if we continue to release carbon emissions into the atmosphere on the same rate we are now, which would almost certainly lead to the collapse of the West Antarctic ice sheet. The other scenario was that pretty much every country on Earth decided to enact extreme carbon emissions cuts.