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 solutions. Rainfall reliability is closely connected to rainfall quantity. The rainfall in the equatorial heart is very plentiful and reliable. However, there is much less rainfall towards the outer edges of the rain belt. Periodic and unpredictable droughts are a characteristic feature of these border zones. There are three climatic zones in
1. a region of persistent rain at and near the Equator, 2. a region on each side of the Equator of summer rain and winter drought, and 3. a region at the northern and southern edges afflicted by drought. All the climates listed in the previous paragraph are modified in the eastern parts of Tropical Africa by the
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