V. Read the following English word combinations taken from the text above. Choose their Russian equivalents.

to exert harmful influence	защита окружающей среды
to search effective ways	глобальное потепление
the global warming	с точки зрения экологии
environmental protection	вести поиск эффективных методов
noxious industrial gases	выброс пыли и газов в атмосферу
from ecological standpoint	круговорот веществ в природе
the natural circulation of matter	оказывать вредное воздействие
healthy biological habitat	вредные промышленные газы
the discharge of dust and gas into the atmosphere	жизнеспособная биологическая среда обитания

VI. Read the texts below. Use the words printed in italics to complete them.

A: Chimneys, rivers, rain, smog, chemicals, mixture, power.

In December 1952, nearly four thousand people died in London. They died because they breathed a terrible … of smoke and fog which the Londoners called … . Scientists discovered that the largest part of the smoke was emitted by factories and … stations. The specialists advised to build tall … so the smoke would blow away. This decision helped to solve the problem in London but it caused more problems in some neighbour areas. The smoke went high up into the sky where the … in the smoke mixed with water to make acid … . The wind blew away this mixture of gases and water, and caused acid rains in Scandinavia and Northern Europe. The acid rain destroyed buildings in those countries, polluted … and lakes.

B: Pesticides, to spray, mixture, chemicals, to stimulate.

The valley of the river Po in Northern Italy is an important agricultural area. The farmers in this region produce much very good food but they use a lot of chemicals to … the growth. They … the fields with fertilizers and … to feed and protect the crops. Unfortunately, when it rains, a great part of these … are washed away from the soil into streams and finally into the river Po. This river carries the chemicals into the Adriatic sea. Thus, an algae was growing in the rich … of chemicals in the water. Fed by chemicals algae turned red and in 1989, some areas in Adriatic sea became as red as blood. Tourists were frightened about the colour of water and refused to swim in red sea.

VII. Read the sentences, insert the proper prepositions into them. Try to memorize some of these expressions.

22: of (9) on (1) in (4) with (1) into (1) to (2) by (1) from (2)

1. Primitive societies began to disturb the balance … nature only when they started to practice farming … a large scale and keep large herds … grass-eating animals.

2. … the twentieth century, … the advance … science and technology human achievements … conquering nature became greater.

3. The discharge … dust and gas … the atmosphere returns … the Earth … the form … “acid rains”.

4. The planet becomes covered … a layer … noxious industrial gases which keep the heat … getting out.

5. Oil spills, effluent … factories and sewages add … pollution … rivers and seas.

6. Environmental pollution increases the number and variety … diseases, causes the difficulties … diagnosing and defining the reasons … human illnesses, reduces the life-span … a man.