Could someone please explain to me how the IPCC can be calling for urgent action when their models are looking increasingly busted?

http://judithcurry.com/2014/03/04/causes-and-implications-of...

I can see three main possibilities:

- their models aren't busted (Judith Curry is wrong, as are those whom she cites)

- their models are busted, and that increases the risk (i.e. risk increases as a result of forecasting being essentially impossible)

- their models are busted, and they're doubling down on a bad bet for political reasons

This story is being discussed here:

https://news.ycombinator.com/item?id=7499072 (22 points, 28 comments)