Unfortunately we cannot feed the world today. We can feed the 1st world. Some for the 2nd, nothing for the 3rd. And that because we industrialized agriculture in the West, we use fertilizers, and we have good lands and peace.
Discussion
There are two different issues at play here, one the way food is produced and distributed and two the way fiat erodes capital and concentrates it. In my opinion people going hungry aren't a victim of not enough fertile ground or workable land but moreso the erosion of their capital due to fiat systems. This is and example of how inflation is exported too the poorest in the world. It's possible that these people should have moved if in fact they could no longer grow enough food to feed themselves but instead they stayed being proped up by fiat subsidies. Definitely a complex issue to think about. In my opinion, fiat is the biggest problem we face, all the solutions are available but the incentive to utilize them isn't.
This podcast with Peter Allen touches on a lot of what this discussion has brought up: bullshit narratives, misconceptions about effects of dietary choices, can a growing population be sustained.
Rev.Hodl responses are terrific and thoughtful.
You can also take a look at some of the permaculture accounts on here! lots of good stuff going on in the world