Something doesn't have to be the main driver to still have an impact on the problem. Increasing food production efficiency would have a marked impact on the problem, without requiring you to to figure out how to end war or "fix" energy or logistics.
You could make corn in the US free and that would not help it get to people in the DRC who are blockaded by Rwanda backed militias. It would not make transporting that corn to Syria cheaper or easier. I will give that it would make ethanol cheaper, so that's cool at least.
