population growth has posed a growing threat to our planet, especially the developing countries,
the United Nations has expressed concern about the challenges that humanity is facing and will
migration from poor countries to the developed world
pressure on densely populated countries, mainly developing countries in Asia,
urbanization will be the most difficult problem for the country. While the rural population is increasingly sparse and insufficient economic construction workers, are in cities, the dropout rate and increase unemployment, a growing number of slum
urbanization process and the wave migration will increase
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