Currently, with the industrial fossil-fuel food regime, food insecurity (up to famine) happens:

• due to markets pricing out poor people (doesn’t matter if there’s food around if you can’t buy it)
• war - destroying food growing capacity, killing or scaring away the agriculture workers, stealing harvests, or just preventing harvest seasons
• blockades, usually part of war, which is what you see in Gaza
• local production failure due to various reasons like: weather catastrophes, drought, epidemics, floods, but also economic failures such as the fail to buy inputs by the time they’re needed, such as not being able to buy fertilizers because they got much more expensive to import (because production decreased and/or demand increased such as subsidized demand from rich countries)

As the climate gets more chaotic, drought, weather disasters, diseases and pests are going to become major factors in this food security state. The other aspect are inputs, especially fertilizers, which depend on fossil fuels which are both running low (getting expensive) AND must be replaced with something that isn’t destroying the planet’s climate. This is called a predicament.

In any sane society, resources that are scarce would be rationed according to need. And that means using cropland and inputs for food for humans. This is both for dealing with food insecurity and for mitigating climate heating.