I've given up putting stuff like this on Yahoo. Anyway, real article is in GRL, but citing them is useless since AGU doesn't have open access. For those of you with academic IP addresses, your institution might have a subscription so you can see the article in it's original format. Otherwise, here is a summary:
Oh yeah, I forgot to add that this is a great example of how while the basic physics is fairly well understood, the nonlinearities, feedbacks, and couplings in the system are far well less known, and of the ones that are being discovered, they are all positive feedbacks or couplings driving further warming.