Counties such as China, India and Japan have unsustainable population growths. In fact many experts are of the opinion that the population ‘explosion’ which is now a very worrying concern, is the most serious threat to life on this planet. Give some suggestions to address this problem.
开头段：背景引入 + 话题介绍
主体段 1：可采取的措施 1
主体段 2：可采取的措施 2
交代背景：It is true that the population ‘explosion’ which has taken place over the last century, is a very serious problem. One of the main reasons for this unacceptable population growth is a lack of understanding about the environment. Over-population is the major reason for the pollution of water, soil and air. It is also often the cause of starvation and even wars.
话题介绍：Experts have put forward many suggestions to address this problem. The following are just a few of these.
### 主体段 1
主题句：The most important weapon we have to fight population growth is education.
递进解释：This should start at a very early age. Before children even go to school, TV cartoons and children’s programs can be used to educate the very young. At high school level, students can be taught about the problem more directly. At university level, scholarships should be made available to students who wish to study further in this field. International exchange groups may also help to increase awareness.
### 主体段 2
主题句：Another important means of controlling population growth is to disadvantage people who have more than one or two children. This can be done, as it is in China, by means of a higher tax.
递进解释：Although it is controversial, persons who come forward to be sterilized could be given a sum of money. It may also be possible to make it advantageous for people to have only one child by giving such couples a special tax deduction.
It should also be possible to make contraception devices free to the public and easily obtainable. This problem is a very difficult one to address but we should make every effort to do so. There are many other problems which are related to over-population such as increasing crime, illiteracy and pollution. So by addressing one problem we would be addressing the others as well.
it is true that 做...是正确的
address this problem 解决问题