The fact that models are constantly refined doesn't mean they're "scrapped." The core model, of CO2 being a greenhouse gas that drives feedbacks--particularly w

The fact that models are constantly refined doesn't mean they're "scrapped." The core model, of CO2 being a greenhouse gas that drives feedbacks--particularly water vapor feedbacks, but others as well--is very well attested to. It's true that climate is complicated and there are significant uncertainties in how they might interact. Most of those uncertainties, however, lie in the positive direction. That's part of the reason why the expected mean warming is much closer to the lower bound than the upper one.