t be considered when estimating the earth's capacity by any of the above definitions. For instance, one must consider the level of prosperity of the people, the technology available, and the distribution of available wealth. Under certain conditions, the world might not easily hold even 1 billion people, while under other conditions a number as high as 20 billion is possible.
             Another factor in overpopulation that must be considered is that of life expectancy. According to United Nations estimates, the life expectancy in developed nations in the 1950's was approxim
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