I got this question a while back,
It was meant to be joke but I think it merit serious thought. The question was how would you solve the food crisis in Africa of something to that effect.
Well for onething we can start by slowly weaning First World farmers from their subsidies. African farmers can't export their produce and plow the extra money they could have earn into improving their productivity, their lives, and building up a reserve in case of famine because they can't compete with goods that are not cheaper but are made so because of subsidies. A note to First World nations: instead of sending aid, most of which goes into the pockets of the oligarchs or use as tools of manipulation, reduce the subsidies. The less subsidies the less aid needed to be sent.
At the same time knowledge is power and the most effective tools. Send experts to help farmers increase productivity or jumpstart their agricultural research cantres. In effect teach them to fish, fish better and find ways to learn to fish better.
Both must work together he who helps and those who are helped and both must be willing to achieve the collective goal.