yes

fun historical fact: when they were building the first computers part of the way they wrote their grants to the gov agencies which were funding them was to suggest that with these new computers, you could model the climate much more accurately, perhaps even enabling a fine grained control of it.

so not only do i think agi could stop climate change i think maybe it could realize von neumann's dream of climate/weather control and manipulation

https://en.wikipedia.org/wiki/John_von_Neumann#Weather_systems_and_global_warming

(von neumann actually wanted to intentionally induce global warming!)