I don't think it's "simple" at all, because you have to look down into the details: doing what costs what, what are the worst case projections, how much it costs (theoretically) to avoid them, what are the best case projections... all that kind of stuff, as well as look skeptically at margins of errors on various projections. Not as exciting as yelling "doom! gloom!" or saying "problem, what problem?", but ultimately more productive, in my opinion. From what I've seen, some sort of middle course is likely the best approach for the time being. Start doing something, but maybe not going all out, just yet.

On an interesting, and related note, an economist points out that property prices aren't falling (or at least relatively more where all prices are falling) in coastal areas that would be hit by rising sea levels.