Man can.t go on increasing his number at the present rate. In the next 30 years man will face a period of crisis. 26 experts believe that there will be a widespread food shortage. Other experts think this is too pessimistic（悲观的）, and man can prevent things 27 worse than they are now.

One thing that man can do is to limit the number of babies born. The need for this is obvious, 28 it is not easy to achieve. People have to be persuaded to limit their families. In the countries of the population explosion, many people like big families. The parents think that this 29 a bigger income for the family and ensures there will be someone in the family who will look after them in old age.

Several governments have 30 birth control policies in recent years. Among them are Japan, China. India and Egypt. In some cases the results have not been successful. Japan has been an exception. People were encouraged to limit their families in the 1950.s, which has effectively reduced the birth rate in Japan.



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