Matt Huber and his student Ryan Sriver are onto some interesting ideas about tropical storms to say the least. Following on some ideas of Kerry Emanuel's they are arguing that there are no ifs or buts about it. If their argument, which looks pretty solid to me, is correct, increased tropical cyclone activity is inevitable in a warming scenario. If you have access to the May 31 issue of Nature you can look up the original article.
Matt also points me to this nice summary of the PETM climate crisis of 55 million years ago, including some of the implications of his work, so I thought I'd share.