Food shortages aren't going to happen as long as seed companies are still creating GMOs to cheaply grow crops in places that they have no right existing in combined with world superpowers are still subsidizing the hell out of agriculture for bread & circus reasons. You'd lose the small independent farmers growing organic avacodas or whatever but the big staple crops aren't going at risk at all from climate change.

Not to say our food production couldn't collapse from a superbug decimating a monculture of wheat or something, but that happening would be completely independent of how healthy Earth's climate is