Read the email and put the paragraphs in the correct order.

C, A, B,

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Первое С, второе А и третье В.

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There are a lot 1….... problems facing people 2….... the beginning 3….... the new century. The problems to be urgently solved are: ethnic conflicts, the growing world population and the ecological crisis. The first two problems are not so vital because they are local ones. Ecological crisis is our mutual problem.

The environment needs to be protected. Millions 4….... people 5…... our planet suffer air pollution: cars, factories and plants produce wastes that poison the atmosphere and cause the holes 6…... the sky. Scientists first discovered the hole 7…... 1982. Now it's getting bigger. Man-made chemicals (CFCs) destroy the ozone layer. The ozone layer stops the utraviolet radiation 8…... the sun which causes sunburn and skin cancer. CFCs come 9…... fridges, air-conditioners, aerosol cans and 10…... the manufacture 10…. ... some plastic products. There's another problem. We breathe 11….... carbon dioxide (C02). During the last century we have produced much 12… ... it. The sun warms the atmosphere and then some of the heat escapes 13 ……. space. But the carbon dioxide doesn't allow it to get 14…...... The atmosphere becomes warmer. It is called the "greenhouse effect" and it is dangerous 15 ….... all the living-beings. Some scientists think that it'll make the world hotter and change the climate all 16 ….... the world.

Trees take carbon dioxide 17….... the air and produce oxygen. Big rain-forests are very helpful. But parks and gardens 18…. ... our cities also help us. We should remember that trees can help the Earth and try not to destroy them. That's why we should be kind 19…. . .. birds and animals, they protect large and small forests 20……

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