The variety of polluting sources is growing. The expansion of urban territories with asphalt-covered roads, the increase in the production and the complexity of chemical substances and combinations used in everyday life have led to the ever increasing role in polluting water resources played by the drainage from the territory of cities, towns and villages. Such scattered sources of pollution cannot be enclosed in a pipe with a purifier mounted on its outlet.
The sphere of water pollution is broadening. During recent years a new problem appeared – the pollution of ground water. It is caused by a great variety of reasons: numerous waste dumps scattered all over the area and exposed to the influence of rainwater, polluted surface reservoirs, the disposal of sewage from factories (waste matter as well) and the use of water on oilfields.
In our era water pollution is changing from a national to an international problem, especially in territories where rivers cross several countries. The seas and oceans are also becoming seriously polluted.
The figures of the Earth's ecological calamities are distressing. Forests are disappearing at the rate of 20 hectares per minute, or more than 500 000 hectares a year. The volume of atmospheric oxygen annually decreases by 10 billion tons – a consequence of the destruction of forests and the contamination of water reservoirs.
The planet's genetic fund has sustained irretrievable losses: hundreds of species of animals, birds, fish and plants have disappeared forever. All these figures show our race to ecological catastrophe.
Our scientific knowledge and technological advancement make it possible to eliminate It, if people use good will and make considerable Investments for that purpose.
The essential feature of environmental protection is that many problems can be solved only at the level of world community. It is the joint efforts of many scientists and special public organizations that can deal with the problem and make necessary measures to protect the environment.
Joint actions of all countries can eliminate pollution and achieve successes in purifying air, water and soil and in safeguarding national resources.
EXERCISES:
I. Translate the following into English:
Комментарии к книге «Английский язык», З. К. Мадиева
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