World Population

6. sprawl: when cities become bigger and bigger and even encroach on natural habitats
8. a situation that causes problems
10. all the people who live in a particular area, city or country
11. the effect something has on something/somebody
12. a lack of something
13. the service of providing medical assistance
15. make something more or bigger
16. make something less or smaller
17. something that can continue or be continued for a long time
19. the pill, condoms, etc
20. Tokyo, Dehli, Shanghai
21. buildings, transport, power supplies, etc
23. the feeling of wanting something to eat

1. Growth in the proportion of a population living in urban areas
2. data relating to the population and different groups within it
3. agree to or approve of something
4. the size, amount or degree of something
5. the reduction of something in large amounts
7. the state of not feeling safe or protected
9. to make something much worse
14. fighting over something
18. the movement of people from one country to another in order to find work and/or a better standard of living
19. extremely important because something in the future will be affected
22. population: an increase in age of those over 60 while the age of those under 15 decreases