it seems you're not considering the effects that the climate crisis is expected to have on the conditions that our food production infrastructure is based upon. Water/soil/temperature are all pretty big components of this process that will (and already are to some extent) impact our ability to grow food.
And we can't change crops? Or change methods? I'm not buying that. Humans grow crops everywhere, from equatorial deserts to the arctic circle. And the changes that make a given crop totally unworkable (as opposed to not quite as efficient as before) are generation-scale, not the flip of a switch.
Water will still exist. Soil will still exist. Short of postulating worst-case scenarios (which are possible), this is all stuff we can handle with existing technology, much less the technology of a century from now.
