In 18 years. all three regions will have doubled their current populations. At the same time. the industrialized world continues to look increasingly attractive to people living in cities that grow more filthy and more crowded with each passing day. Cities throughout the developed North will continue to become more crowded because of immigration until conditions in the Third World are sufficiently improved through the lowering of fertility rates in those countries currently growing beyond their means. In the effort to reduce population growth. the 1990s are the crucial years. Nearly half the population of the developing worldsome 2 billion peopleis under 15 years of age.
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immigration