I read an article the other day about how Miami residents are mostly not concerned and seem to hold up other places such as Rotterdam who are doing a good job dealing with these issues but not understanding that Miami's geology and hydrology is vastly different and is going to leave them seriously screwed.
I think he means invest in seawall manufacturing companies, as opposed to some bizarre financial instrument that allows you to profit from the demise of an entire city.
As parent mentioned Miami can’t be protected with sea walls because the geology allows water to seep up and will drown the first floor of buildings with any sea level rise