Match sentences 1. Are people's lives affected if the a. Reducing births around the world population increases? 2. What is the current world population? b. It could lead to higher levels of pollution. 3. What can we do to stop overpopulation? c. 3.1 people per sq km. 4. Overpopulation is a serious problem, d. Yes, of course. isn't it? 5. How does overpopulation affect the e. Sounds awful! Something must be done environment? to solve this problem. 6. Many poor people in the city live in f. That may be true. slums because of a housing shortage. 7. What is the population density of g. 7.7 billion Australia? 8. There won't be enough food to feed the h. Yes, it is. world in 2050, will there? IX.