I say we still have to try. Mankind won't get another shot at it.
But I am not going count on getting a reasoned response any time soon.
AGI could help with that by culling humans, or at least seriously constraining human behavior. We're perfectly capable of doing that ourselves, although such behavior tends not to be popular.
Realistic scenarios in which AGI solves climate change for us, in time, seem highly unlikely.
Agreed! That should be the number one priority.
I also agree that it is unlikely that AGI will fix climate change for us in time.
What it might help with is adaptation. If all our attempts in trying to control the giant intricate set of climatic and ecological feedback loops we are disturbing don't work, then it might help us with designing appropriate technologies to cope with what the world has become.