Maybe I'm being simplistic of overly optimistic - but I would think that there would be a massive opportunity for collaboration with fluid dynamics to simulate and 'fast-forward' the weather to see likely impacts.
It might not be correct the first time, but as we map the changes from prediction against the reality, we could adjust for factors that we hadn't considered.
It seems to me that we shouldn't be too far from accurate weather prediction and perhaps with huge amount of data capture having a digital twin of the planet in which we have enough confidence in to model potential climate impacts of policies, products could allow us to have robust discussions around where we're headed and what paths we could take to adapt or overcome the impacts we're already facing.