When you read the sentence, the population of the earth has grown by10 people. That may not sound much,  it's about 14, 000 people per hour. Most of these new people are born in  (develop) countries. These countries are found in much of Africa, South America and parts of Asia.

    In the developed countries of Europe and North America, the population is growing very (slow). This is  women in these countries have, on average(平均), only one or two children. But in the developing countries, many women have five  more children. In the developing countries, more than one billion people already live below the poverty level(贫困线). These people don't have enough food  (eat) and they live in poor housing. Children get little or no time at school and suffer from many  (kind) of diseases.

    The UN has said that the world's population will reach over 10  (billion) by the year 2100.If the number  (make) your head spin(眩晕), you're not alone. Many experts(专家) are worrying that so fast population  (grow) could have very bad results. It could hurt the environment and increase the number of poor people.

    There are many kinds of pollution around us, 1 air pollution, soil pollution, noise pollution and light pollution. They are bad 2 our health in many ways.

    Burning gas, oil and coal creates air pollution. It can cause some eye and breathing problems.

    With the 3 of pollution and the development of industry, litter is everywhere. It makes our environment dirty. People put lots of rubbish in the land. Farmers use too many 4 in the fields. They destroy the soil.

So soil pollution has become serious.

    Noise pollution can make people 5. For example, people may lose their hearing if they have worked in a 6 place for a long time. Too much noise can cause high blood pressure 7.

    Having worked for a long time in strong, changeable light 8 cause some kinds of illnesses. It makes people feel 9 and is especially bad for the eyes.

    With 10 pollution, our planet will become greener and our health will be better. Let's be greener people.

    Is the world too crowded? Well, that's a hard question to answer. It's a matter of perspective(视角). In Montana, you might drive for a mile in any direction and not see another human being. In Macao, about 50, 000 people live in every square mile!

    What is true is that the world's population doesn't stay the same. It has been increasing at a very fast rate. That's in part because in each generation(代) there are more people who would like to have children than those in the last generation.

    Five hundred years ago, the population of the world was about 425 million. Right now it is doubling every 40 years. That means, if this rate of growth continues, when you are a parent, there will be twice as many people on the earth as there are now. Wow! That's a lot of people! Soon the world's population will probably reach 8 billion. Some people worry about that! But there is a lot of disagreement about the view that how many people on the earth equals(相当于) too many people. But everyone agrees that the more people there are, the more resources the world needs to feed, store and take care of, and the more need there is to think carefully about how we live and use the earth's resources.

    China is a great country with the largest population in the world. In order to solve the population problem, our government carried out one-child policy(政策) before. When it is carried out for some time, many people see not only its advantages but also disadvantages.

    From 2016, two-child policy was put into effect. In my opinion, two-child policy is good. First of all, two-child policy is the gift for some only child. For some families, maybe the parents are only child and they can also have only child. Besides the loneliness of their child, when their child grows up and they grow older, their child marries an only child girl, the burden(负担) on their child and his wife is too heavy. Their child and his wife have to take care of two couples. Usually, looking after an old couple is a little difficult for a young couple. But if their parents have two children, they can share the burden of taking care of their parents. It would be much better. Secondly, two-child policy can guarantee(保证) the number of Chinese population.

    All in all, one-child policy has been out of date. And two-child policy is needed and necessary. It can solve the problems of today and the future.

    There are about 7 billion people on the Earth now. The world's population is a big problem because it will cause lots of problems in the future. More people will need more food and more room.

    The world population growth rate rose from about 1.5 percent per year during 1950-1951 to over 2 percent in the early 1960s.Although the growth rate thereafter started to fall due to(由于) people's getting married later as well as the development of technology, the rate is on the rise again now.

    The important thing is not how large the population of the world is, but how fast the rate increases. The world population increased from 3 billion in 1959 to 6 billion by 1999.The world population will grow from 6 billion in 1999 to 9 billion by 2050.This great growth of the population will create a big problem by the year 2100-there will be over 10 billion people in the world then.

—Yes, and he also has           eight-year-old daughter.

—China, of course.