I mean, that would be the standard neoliberal econ answer, since food is a private good and the climate is a public good / common pool resource.

Yeah, GPT is like a good undergraduate student who can write well, but is basically parroting mainstream neoliberal viewpoints, without much ability to discuss nuances like how even if you agree that climate is a public good, current climate policy creates all sorts of economic distortions and resource misallocations, based on non-existent or extremely shaky cost benefit analysis