And agreed that there are limitations in long term regional climate modelling. That's simply a consequence of model complexity and limits of computing power. Though they are able to derive a fair understanding of expected regional impacts in many cases.
That, of course, doesn't negate the clear and well understood impact of greenhouse gasses, to create warming, and the impact of that on climate broadly and on factors like precipitation, glacier loss and sea level rise. Even simple models from 30 or more years ago make pretty good predictions of temperature rise that we've seen to date.
