Where I'm at, in the North, recent weather has only increased climate control costs due to colder winters and hotter summers. I can't say for sure it's global warming at work.

William's Nordhaus models for which he has received the Nobel prize predate the millennium, and have been superceded since then by much better models. His models are highly problematic, now that we know that you cannot extrapolate the average temperature on GDP due to increased amplitude, and for many other reasons. That is why the Nobel committee awarded it not for the current relevance of the results, but for the pioneering nature of the research.