14. What are activities of human beings which destroy the planet earth?. British Council

　　- Pollution

　　- Polluted the air and land.

　　- Cars and factories are very dirty - dangerous for people, wildlife and the environment.

　　- 2 serious pollution problems are:

　　- Acid rain: this happens when gases and chemicals mix with water in the air. The mixture travels for hundreds of miles and finally falls back to earth. Because Acid rain contains a lot of chemicals - It kills fish and trees.

　　- The Greenhouse effect: gases and chemicals are the reason for this problems, too. Some of them stay in the air like a blnket around the world. Because of this blanket, the Earths climate is changing and getting hotter.

　　- Desserts: soil erosion:

　　- More people - fewer trees - greater use of land - thinner soil - erosion - famine.

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