单项选择题

The United Nations published a report that was called "The State of World Population". It shows that the growth rate of world population will actually go down in the next ten years. The growth rate will fall from the present 1.8% to a rate of about 1.6% by the end of this century. But the report also points out that problems of food, health care, housing, jobs and schools will get worse unless we do something about the situation.
Why is this Although the total growth rate of the world population will decrease, in some countries there will still be a big rise in the population. More people will be born in Third World countries than in the richer Northern countries. So the population will grow faster in poor countries; and the problems in these countries will be very serious. This is because the family is more likely to survive if there are a lot of children to work for the members who become old or who cannot find work.
A survey of the UN also shows that the growth rate is low where there is a higher level of income, better education, more health care and better living conditions. In this aspect, government plays an important role. So, the conclusion of the UN report is: "Look ’after the people and the population will look after itself. \

What is the reason for the going down of the population in rich countries().

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