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Since ancient times Nature has served Man, being the source of his life.

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For thousands of years people lived in harmony with environment and it seemed to them that natural riches were unlimited.

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But with the development of civilization man's interference in nature began to increase.

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Large cities with thousands of smoky industrial enterprises appear all over the world today.

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The by-products of their activity pollute the air we breathe, the water we drink, the land we grow grain and vegetables on.

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Every year world industry pollutes the atmosphere with about 1000 million tons of dust and other harmful substances.

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Vast forests are cut and burn in fire. Their disappearance upsets the oxygen balance. As a result some rare species of animals, birds, fish and plants disappear forever, a number of rivers and lakes dry up.

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The pollution of air and the world's ocean, destruction of the ozone layer is the result of man's careless interaction with nature, a sign of the ecological crises.

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Thanks for your attention!

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