Greenhouse Effect: Global weather monitoring scientists have reported that the temperature of the atmosphere of the earth is rising gradually. This increase in the temperature is due togreenhouse effect.
The name of the phenomena is derived from a glass built house or enclosure in which the plants are grown. Sun rays pass through the glass shields to reach the plants (for photosynthesis) but the heat coming from the sun cannot come out for the greenhouse and thus the temperature of the greenhouse rises. Recently it is reported that the temperature of the atmosphere of the earth has risen 1-degree centigrade. This trend of temperature rise is called global warming.
The greenhouse effect is mainly caused by an increase in the number of greenhouse gases. Their gases are carbon dioxide, nitrous acid, methane, chlorofluorocarbons and benzene in the atmosphere. Scientists have estimated that the concentration of the carbon dioxide in the atmosphere before the industrial revolution was between 275 and 285 parts per million and after it by 1980 it had risen to 338 parts per million. This increase is due to burning of fossils fuels and destruction of the forests.
Even a very small amount of carbon dioxide produces an important greenhouse effect. Much of the solar radiation that reaches the surface of the earth is absorbed in the ground. As a result, the surface is heated up and it, in turn, emits its own radiation of very long wavelength.
Atmospheric carbon dioxide acts as a shield to these heat waves, so the same of out-going radiation is trapped, causing the earth’s surface to heat up still further. It has been estimated that the greenhouse effect warms the earth’s surface by as much as 15-degree centigrade.
Almost all the radiation is sent back into space and temperature does not rise. Actually, the earth is in a state of thermal equilibrium which keeps the surface temperature fairly constant. This equilibriums, however, disturbed the gradual increase in the atmospheric carbon dioxide as a result of industrialization. It is noticeable that the highest intensity of greenhouse effect is discovered on the planet, Venus.
The planet is wrapped in a thick blanket of carbon dioxide. It is not the planet nearest to the Su. Mercury is the planet nearest to the sun but it is not the hottest planet. Venus is the hottest planet with its surface temperature 400-degree centigrade. This high temperature is due to the greenhouse effect on the planet caused by its high concentration of carbon dioxide in its atmosphere.
Carbon dioxide is not the only gas to cause the greenhouse effect. Chlorofluorocarbons (CFCs) trap the heat 10,000 as carbon dioxide. They are mostly used in the replaceable luxuries like air conditioners, perfumes and fast food containers. They are also leading destroyer of the ozone layer in the upper atmosphere of the earth. Alarmed by a series of droughts and heat waves, a ban has been suggested on CFC production by the land of the century. It would probably cut greenhouse warming –after a lag- by up to 15%.