The reduction of the population due to the decrease of population of childhood. The population decreased childhood in developed countries. From the number of children born to less each year, less birth rate Would result in the working-age population in the future. Because of a new born baby to replace the working-age population in the future. The less, there are many causes, including living single more slower marriage, married but had no children intended or intended. Need or have less of a spouse, too often that the marriage. And a barrier to progress in the work, also the factors that cause the increase of population that are caused by the Research on medical knowledge of hygiene of population, the progress of technology. Social system change. The problem of the increase of population Cause food shortages and an army of resources. Degradation of the natural environment. The quality of life and society. And problems of international conflict
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