Earth pollution

Water pollution

Air pollution

POLLUTION

Pollution is known to be of great concern to both science, industry and to humanity as a whole. There has always been pollution, even when man was not present. When man appeared upon earth, he added much to the pollution. As the population of man on the earth increased, pollution increased too, it being increased in three ways: through the numbers of persons, through the industrial activity, and through man’s use of devices such as cars that cause pollution. The study of pollution could be divided into three main parts: pollution of the air, of water and of the land mass. To study this problem is very important for man.

Every smoking chimney turns out to be a source of air pollution. Home furnaces tended to burn soft coal incompletely, thus adding unburned carbon particles to the air.

The use of natural gas or oil that have a negligible mineral content is of great help in reducing pollution, but has the disadvantage of rapidly consuming materials which could better be conserved for future generation as raw materials for the manufacture, for example, chemicals and plastics.

It has been found that some chemical processes, such as the manufacture of lime, Portland cement, steel, tend to give off much dust. Lead, bromide and chloride emitted from the exhaust of automobiles which burn lead-containing gasoline produce a lead-chloride-bromide aerosol which is considered to be a common air contaminant in urban areas, it being toxic to people. The chief atmospheric gaseous pollutants originating from the earth’s surface appeared to be oxides of sulphur, oxides of nitrogen, incompletely burned hydrocarbons, and carbon monoxide.

These gases are known to react with energy from sunlight to produce photochemical smog. Smog not only can be highly irritating to eyes and lungs, but it can also cause extensive damage to vegetation.

Some cities simply run their raw sewage directly into nearby natural waters. This is one of the worst types of water pollution.

Another type of pollution of sea and ocean water is petroleum oil, it taking place in connection with off-shore drilling operations. It should be also noted that unfortunately there is as yet no satisfactory method of overcoming the effects of oil spills, although many methods have been tried.

In addition to air and water, the solid part of the earth is also in danger from pollution. Solid wastes include such things as: metal cans, glass bottles, plastic containers, ashes from the combustion of coal and wood and radioactive isotopes. The problems created by pollution are very difficult; fortunately great progress is being made in their solution.

Hundreds of new devices to trap and neutralize the harmful substances contained in discharged gases go into service. As a result, in more than 70% of cities where the air monitored, discharges of dust, sulphur gases and hydrogen sulphide were either stabilized or reduced altogether, harmful industrial pollution of the air of cities and industrial centers having been greatly diminished throughout the country.

Extensive measures are being taken to set up reservations and carry through biotechnical measures for the protection and reproduction of species of animals, birds and valuable fish.

Much money is being spent, but it should be noted that money alone is not enough to protect the environment. The attitude of people is vital and much depends on the people.

Дата добавления: 2015-01-03