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Текст:
Our life becomes more 1) comfortable and more interesting. But we seldom think that the majority of 2) inventions bring harm to a man. Today the greatest problem for humanity is 3) pollution. Pollution is the 4) contamination of the environment including air, water and land. This problem is 5) extremely typical for heavily 6) industrialized cities and towns where metallurgical plants, steel mills, mines, chemical plants are situated. Uncontrolled emissions of harmful 7) substances and dust pollute everything around us. Very often they are the reason of 8) acid rains poisoning eatrh and water, destroying forests and even buildings.
It is worth 9) mentioning that one third of all emissions into the atmosphere originates from automobile transport.
During some period of time it was considered that 10) nuclear power stations were safe. In 1986 11) Chernobyl disaster showed that nuclear energy can be extremely dangerous. Large areas of agricultural and forest lands of Ukraine, Belarus and Russia will remain unsafe for a man for eight thousand years.
Another problem of big cities is 12) wastes. The wastes from plants and 13) factories contaminate water and soil. Household wastes such as all kinds of plastics and so on remain 14) unruined for tens of years. Another reason of soil poisoning is the use of materials which help agricultural products to grow fast but these products are 15) harmful for man.
The list of problems may be endless - 16) greenhouse effect, ozone holes, etc. It is clear that it is necessary to use 17) purification equipment at the plants and factories look for wasteless technologies, learn to use natural sources of energy, such as wind and sun, use new recycling technologies.