Sub-Saharan Africa has the most rapidly growing population of any region of the world. The human population is about 5M0 million and it is expected to reach about 1300 million by the year 2025. In 1990 354 million people, 71% of the population of sub-Saharan Africa, lived in rural areas and by the year 2025 this figure will have increased by more than 68% to about 5W0 million. Cities in sub-Sah…