A、Increase food production. B、Increase oil production. C、Birth control. D、All of above. D增加粮食产量、石油产量、延缓人口增长速度都是解决人口增长的途径，在文中皆有提及

W: Good morning.
M: Good morning.
W: Well, what are your predictions about the world? What is it going to be like in the year 2020?
M: Hum, if present trends continue, I’m afraid the world in 2020 will be more crowded and more polluted than the world we live in now.
W: Don’t you think we will be able to cope with the increase in world population?
M: I don’t think so. Even though production is constantly increasing, the people of the world will be poorer than they are today. For hundreds of millions of the desperately poor, the supply of toad and other necessities of life will not be any better. And for many they will be worse, unless the nations of the world do something to change the current trends.
W: What is your estimate of world population in year 2020?
M: If present trends continue, that is with the number of births by far could approach 6,500million people.
W: How many people are born every day?
M: About 250 every minute, but only 100 people die!
W: That’s worrying! Will there be enough oil to satisfy our needs in the year 20207
M. During the 2000s, world oil production will reach the maximum and the price of oil will begin to increase. At the next ten years of the century, the available supplies will not be sufficient for our needs. So , at least part of these needs will have to be met by alternative sources of energy.
W: Well, that’s a warning that we all need to take seriously. And with that warning, we end part one of this week’s.