> The reasoned response to climate breakdown is to start taking it seriously at a global level.

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.