Question

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Say what is pollution and why it can be dangerous. Here are of nowadays.
1) to pollute the air, the soil, waters of lakes, rivers, seas and oceans
2) to have problems with water, food, air
3) to have much noise it cities
4) not to have clean air especially in big cities
5) to throw things into rivers
6) to make dumps in fields and forests
7) to kill many birds and animals
8) to influence human heath
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Answer 1

1) Pollution is the contamination of the environment. Three major types of pollution are water pollution, air pollution and soil contamination. 
2) In the near future, people are going to have problems with food, water and air. We need to start saving water, because if we don't, shortly, there won't be any fresh water at all. Food will be a problem someday soon as well. Contamination of the soil leads to the fact that the plants which are grown in this soil can be poisoned and dangerous for people. Air pollution is a significant problem in the modern world too. It harms peoples and causes the greenhouse effect.
3) In large cities, there are often harmful or annoying levels of noise. It could cause a lot of problems such as sleeping disorder, cardiovascular problems, hearing issues and so on.  
4) Air pollution is a problem, especially in big cities. It leads to the severe respiratory diseases, like asthma or even cancer.
5) Factories put dirty water containing chemicals back in the river. People sometimes throw garbage into rivers. Polluted water also carries diseases. Animals drink the water and die because of it.
6)Dumps in the fields and forests kill many animals every day. Also, factories sometimes dump waste in the forests and contaminating the soil
7)  Another big problem is the extermination of birds and animals. A lot of animals and birds that were there fifty years ago, now are extinct.
8) Pollution of the environment influences humans health in a bad way. Some people die because of that or have severe diseases.