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Global Warming
Scientists say the temperature of the earth could rise by 3C over the next 50 years. This may cause drought in some parts of the world, and floods in others, as ice at the North and South poles begins to melt and sea levels rise.
Global warming is caused by the greenhouse effect. Normally, heat from the sun warms the earth and then comes back into space.
But carbon dioxide (углекислый газ) and other gases in the atmosphere catch the sun’s heat, and this is slowly making the earth warmer.

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The Ozone Layer
The Ozone layer is a layer of gas high above the surface of the earth that helps to protect it from the sun’s ultraviolet radiation, which can damage our skins and cause cancer.
Scientists have recently discovered holes in the Ozone Layer, caused by substances called CFCs (clorofluorocarbons (хлорфторуглероды)) CFCs are used in refrigerators, aerosol cans and in the manufacture of some plastic products. Some companies now make products that do not contain CFCs, and these are often marked “Ozone Friendly”

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Deforestation
Rainforests help to control global warming because the absorb carbon dioxide. In recent years, large area have been destroyed, as the trees are cut down for wood or burned to clear the land for farming. The burning releases large amounts of carbon dioxide into the atmosphere.
Many rainforests grow on poor soils, and when they are cut down or burned, the soil is washed away in the tropical rains, so that the area may turn to desert. Many plant and animal species that live there could die.

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Pollution
Factories, power stations and motor vehicles release lots of carbon dioxide and other gases into the air. This is a major cause of the greenhouse effect. A lot of petrol contains lead (свинец), which is very poisonous and can cause brain damage in children. One of the solutions is to use hybrid cars.
Hybrid cars use batteries but not petrol.
Some poisonous gases come into the atmosphere and then fall to the earth as acid rain. Acid rain also damages trees and buildings, and can kill fish in lakes and rivers. Rivers can also be polluted by industrial waste from factories and chemicals used by farmers.

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Alternative Energy
Most of the energy we use today comes from coal, oil and gas. But these will not last forever, and burning them is slowly damaging the atmosphere. We need to find other forms of energy. Solar Power (sun’s energy) can be used to make electricity. We can also use wind-power by building modern windmills (ветряная мельница; ветроэнергетическая установка ответить на предложения по тексту

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Bobby was a small farm dog. for years he worked in the country and took care of the sheep with his master jack. bobby was very devoted to his master.  when jack was too old to work, he went away and lived his last years in the city. bobby didn't want to live on the farm without his master. he ran away and went to the city to find his old friend. he looked for him in many places and at last found jack. after that bobby didn't leave him.  jack was very poor, and ill. but sometimes he went to the pub 4md took bobby with him. the landlord of the pub liked the friendly little dog and often gave him some food.  one day old jack died and nobody saw bobby for some time. then the landlord of the pub saw him near his house and as usual gave him some food. bobby took the food and ran away. after that the landlord gave bobby food many times and every time bobby took the food and ran away.  one day the landlord went after him. bobby took him to the town cemetery. there the landlord found that the dog lived on the grave of his old master. he was there every day in good weather and bad.  soon everybody in the city knew about bobby. many people visited him in the cemetery and many children made friends with him. he lived for a long time — until he was 22 years old. when he died, they buried him in that cemetery and put up a statue on his grave with the name and dates of the small dog's life. 

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