Problems
Our world is facing many problems. Two of the biggest are increasing population and pollution.
The population of the world is increasing quickly. Because more babies are born every year and people also live longer. Many people are leaving the countryside to work in the cities, but there's not enough space for so many people.
Another huge problem for the world is pollution. There is so much traffic on the roads the in some cities the air is heavily polluted. We should make more efforts to protect our world.