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Greenhouse
Effect Harms The Ecological Environment
By
Cao Xue
The
earth is the common home of human beings. However, the coat of our home
atmosphere is increasingly harmed. Man has produced a large amount of
greenhouse gas into the atmosphere, which greatly affects the climate
system on the earth and severely destroys the life of human beings.
Atmosphere, made up of Nitrogen, Oxygen and other rare air, surrounds
the earth. The solar radiation is resisted and weakened while it comes
to the surface of the earth through the atmosphere, which give the surface
of the earth a relatively stable temperature to which human beings have
adapted to.
In the recent centuries, industry has been greatly improved with the
development of human society and the revolution in industry. All kinds
of productive activities of human beings have improved our quality of
life, but at the same time, destroyed our environment. In the industrial
society too much coal, oil and natural gases is burned, which emits a
great deal of carbon dioxide and warms the earth. This phenomenon is obvious
especially in developing countries. For example in China, coal, oil and
natural gases are still the main energy sources and make up over ninety
percent in the consumption of energy although hydropower and other new
energy resources have been made use of since the foundation of new China.
We should know the effect of greenhouse and do everything to protect our
earth in order to keep our home.
A
greenhouse is the warm house where crops are grown in the winter in northern
China. It has the function of absorbing heat and preventing heat from
being lost. The atmosphere of the earth has the same function as the glass
of the greenhouse. The short solar radiation gets to the surface of the
earth, but most of the long radiation from the earth’s surface is absorbed
by the atmosphere, thus, the heat radiated from the earth surface is kept
in the atmosphere, which keeps the earth surface from being too cold at
night. It is beneficial to human beings if there is a suitable amount
of greenhouse air and greenhouse effect. There is no atmosphere on the
moon; as a result, the difference of the temperature in the day and at
night is great. If there is no greenhouse air on the earth, the average
temperature of the earth surface will be 33 degrees lower than that of
today and the earth will be a cold planet. On the other hand, the greenhouse
effect should not be too great. For example, on Venus, the density of
the atmosphere is over one hundred percent greater than that on the earth.
More than 95 percent of the air is carbon dioxide and there is a layer
of dense cloud that is about 25 kilometers thick in the air. The dense
cloud is composed of concentrated sulfuric acid. The carbon dioxide and
the dense cloud can let solar radiation get through but they prevent heat
from getting into space through them, so that the temperature on the surface
of Venus becomes higher and higher. It is reported that the air pressure
on Venus is 90 times higher than that on the earth, which is equal to
the pressure one suffers under the water of over 900 meters. People would
be smashed on Venus even if they had iron bones.
 Beautiful Red Tree, By Hans Villamil |
The
greenhouse effect on the earth is perhaps a slow process and the greenhouse
is invisible. It is caused by the increase of such gases as carbon dioxide,
methane, chloride, ozone and nitrogenous oxygen. The increase is the result
of population growth, industrial development, the increase of cities and
the clear cutting of forests. And they enhance the greenhouse effect on
the earth which results in the rise of the temperature on the earth. Scientist
predict that the temperature on the earth will be raised two degrees by
the middle of the 21st century and the polar ice on earth will be greatly
melted and the sea level will be accordingly raised, as a result, some
island country and sea ports will be submerged including such international
cities as New York, Tokyo, Shanghai and Sydney if the surface temperature
keeps rising at the speed today.
The increasingly serious greenhouse
effect is making the temperature on earth rise while the thin atmosphere
outside the troposphere is made cold sharply. The troposphere is heated
by the large amount of heat from the surface of the earth and more and
more radiation of heat from the earth surface hovers over the surface
and heats the troposphere from above to below, as a result, the heat which
can get to the air over the troposphere becomes less and less. The troposphere
becomes hot while the air above it gets cold. When the hot air rises through
the troposphere, it is stopped at the top of the troposphere. Because
the ozone in the stratosphere has the strong ability to absorb the solar
radiation, this layer of atmosphere is made hotter than that of the troposphere
below and the rising hot air loses its buoyancy because of its meeting
the hotter ozonosphere and then stops its rising. Because the chemical
process that destroys the ozonosphere is mainly affected by temperature,
the cooling of the stratosphere will have influence on ozonosphere. When
the temperature is low, the chemical substances from the cold current
that swallow ozone will adhere to the ice grains and begin the chemical
process of destroying Ozonosphere. Because ice grains are mainly distributed
in the polar area where the temperature is below 80 degrees, ozone emptiness
appears above the north and south pole, but it is hard to start the renovation.
The Greenhouse Effect can do great harm to animals, forests and oceans. As the masters of the 21st century, we have the right to develop industry and build a better living environment. However, we have no right to destroy our beautiful planet whether today or in the future. Let us protect our home together and prevent it from being harmed! If you want to discuss our earth with me, please email me.(summer310cn@yahoo.com.cn)!
No. 2 Middle School
Class 13, Grade 11
Cao Xue
Huhhot
Inner Mongolia
China