Right, but the point is that we've already had the test with so2, so it's not really "before they happen".
You can go look up the differences in dissipation dynamics between that and what’s being proposed by the BS in Econ student and his growth marketing cofounder.
Sure - there is definitely some gap between these natural processes and the artificial processes being proposed, but it is a narrow enough gap that it does preclude a fair number of second-order effects, compared to almost all geoengineering ideas that do not have such natural experiment equivalents.