I've spent a lot of a long career building models that fit real-world measurements and have predictive power.
I would never be so dim as to call that doing science. Prediction is not explanation.
As to your item 3: AGW hasn't been falsified because it's not falsifiable, nor has any climate model demonstrated predictive power. It's astonishing how few climate scientists betray any understanding of chaos.
I'll stick with the equally-valid theory that the past is an indicator of the future, that the current warming trend is normal in the scheme of things, and that it should get quite warm in the next few hundred years.