Wow, good question. This is the type of area where it would be logical to apply general equilibrium theory. I would guess construct a CGE model. It would be very data intensive. That is also assuming that data is easy to get hold of.
To be honest, I don't like the idea of messing with our weather. There could be effects that we are not aware of at this point. There would be a lot of unknowns that would also need to be accounted for at some point.