1. In the world, there are many cities which are facing the overcrowding.

2. Saigon is the most populous city in Vietnam with the population is about 8,6 million.

3. Overpopulated cities in public transport have usually overcrowded especially in rush hour.

4. A large number of people have been moving from the countryside to the cities in recent years.

5. There are more job opportunities in the big cities than the rural areas, aren't there?

6. Local goverments have to find a solution for housing shortage.

7. A lot of people who are homeless suffer from health problems.

8. Over the ten years the population in the world will grow by 1 million.