The flooding that is (was?) occurring in Miami was largely the result of a poorly designed rain-drain system, one which was installed with little to no back-flow prevention. This new system, which was put in place into allow rainwater to flow into the ocean more easily and so prevent flash flooding, unfortunately also allowed the ocean to easily flow back into the streets when conditions were right and so caused tidal flooding instead.

This was all covered in detail in the press at the time the problem first started occurring, and of course it made everyone involved look really bad. But then someone came up with "climate change" as the cause instead, so now the guilty parties had something to hide behind. The press had a field day with it, too, using it as "proof" of dangerously rising sea levels.

The attempted solution here (which is why I said "was?") was to install drainage pumps much like the type you find in New Orleans, because apparently going back and adding the proper back-flow prevention devices was going to be too involved and too expensive. But, of course, just as soon as those pumps were activated people started complaining about how they were polluting the ocean. In fact, they probably aren't putting anything into the ocean that wasn't already going there eventually anyway; they just made the situation more obvious.