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People have always _________ (pollute) their surroundings. But until now ___________ (pollute) was not such a serious problem. With the ___________ (develop) of crowded industrial cities the problem has become more important. The most serious _________ (environment) problems are pollution in its many forms (water pollution, air pollution, nuclear pollution), noise from cars, buses, planes, destruction of wildlife and others.
Air pollution is a very serious problem. One of the most alarming forms of air pollution is acid rain. Acid rain is killing forests in Canada, the USA and central and northern Europe. In the USA 1 in 5 lakes suffers from this type of pollution.
One of the most important problems is _________ (deplete) of the ozone layer. The ozone layer protects the earth from the sun’s ultraviolet rays. The ozone layer is being damaged by chlorofluorocarbons. They are __________ (release) by the daily use of industrial and household products, such as refrigerators, air conditioners and so on. Depletion of the ozone layer increases the risk of skin cancer, weakens the immune system of people.
The seas are in danger. They are filled with poison: industrial and nuclear waste, chemical fertilizers and pesticides. The Mediterranean is already nearly dieing, the North Sea is following. The Aral Sea is on the brink of extinction.
Another problem is ____________ (destruct) of the tropical forest. It has a major impact on the world climate. The tropical rain forest is a natural _____________ (protect) for our planet. It recycles carbon, nitrogen and oxygen, helps determine temperature, rainfall and other climatic conditions.
An even greater environmental threat is nuclear power stations. After the Chernobyl accident Belarus has become the zone of the ecological disaster. The Chernobyl catastrophe has affected the destinies of millions of people.
If people want to survive they must solve these problems quickly. Some progress has been already made: 159 countries-members of the UN have set up environmental protection agencies. They hold conferences _______________ (discuss) ecological problems and take practical urgent measures to avoid ecological catastrophe. There are numerous public organizations such as Greenpeace*. They are doing much to preserve environment.