Troszkę Ci to poprawiłem.
One of the main problems in the word is pollution of the environment. People destroy forest, kill animals, and build enormous factories. Cutting the rainforests is a big problem. Logging companies cut tree and kill
animals. If we didn't stop them, animals which live in rain forest would
disappear. They can destroy us all! Trees produce oxygen, which is
one of our most basic needs. A big problem in city is air pollution.
People use a car too often. Car traffic is very high. In my opinion
leaders of countries should ban cars because they pollute air. Air
pollution causes acid rains, which kill trees and plants. Water pollution is a problem, too. In many parts of the world people don't have any
water to drink. We use water for drinking, washing up, watering
garden and of course for living.
All in one, I think we can save water from our bathes and use it for
the gardens. We should walk more often, use a bicycle or public
transport. If we want to protect rainforests, we must make the
logging companies plant new trees.