Tropical Africa: Food Production and the Inquiry Model Hunger is the result of disasters such as drought, floods, the changing of the jet stream patterns and other natural disasters. They are beyond our control. It has been estimated that one third of the land in Tropical Africa is potentially cultivable, though only about 6% of it is currently cultivated. However, to change farming from a low-input, low-yield pattern to a high-input, high-yield pattern necessitates the use of more fertilizer and the planting of high-yielding varieties of crops. There are a number of environmental factors, related mostly to climate, soils and health, resisting easy developmental sol