After World War II, average life expectancy rates have been increasing all over the world. This means a person born today will live 20 years longer than a person born in 1950. However, in African nations like Zimbabwe and Botswana the situation is very different. Life expectancy has been dipping below 60 years. Among the main culprits in both nations is AIDS -- one in every four adults is infected and average life expectancy has dropped to pre-1950 levels. Latest UN projections put the world population at 8.9 billion in 2050 from the earlier 9.4 billion due to increased estimates of aids deaths.
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