Supplying food to sub-Saharan African countries is made very complex because of a lack of infrastructure.

Unless there is one master gene for yield, which I'm guessing there is not, engineering for yield will be very complex. It may happen eventually, but through the coming decades, we must assume that gene engineering will not be the answer to the world's food problems.

Man's survival, from the time of Adam and Eve until the invention of agriculture, must have been precarious because of his inability to ensure his food supply.

Central African farmers don't have any animal power because sleeping sickness kills all the animals - cattle, the horses, the burros and the mules. So draft animals don't exist, and farming is all by hand, and the hand tools are hoes and machetes.

The lack of roads in Africa greatly hinders agriculture, education, and development.

Contrasting sharply, in the developing countries represented by India, Pakistan, and most of the countries in Asia and Africa, seventy to eighty percent of the population is engaged in agriculture, mostly at the subsistence level.