ProtectionProtectionProtectionProtection ofofofof thethethethe EnvironmentEnvironmentEnvironmentEnvironment————————裴永磊（裴永磊（裴永磊（裴永磊（1042403042104240304210424030421042403042））））
Once man did not have to think about the protection of his
environment. There were few people on the earth, and natural resources
seemed to be unlimited. Today things are different. The world has
become too crowded.
We are using up our
natural resources,and
polluting our
environment with
dangerous chemicals. If
we continue to do this, human
life on earth will not survive.
We realize that if too many
fish are taken from the sea,
there will soon be none left.
Yet,with modern fishing
methods, more and more fish
are caught.We know that if
too many trees are cut down,
forests will disappear. Yet, we continue to use powerful machines to cut
down more and more trees. We see that if rivers are polluted with waste
products, we will die. Yet, waste products are still put into rivers. We
know that if the population continues to rise at the present rate, in a few
years, there won’t be enough food.What can we do to solve these
problems? If we eat more vegetables and less meat, there will be more
food available. Land for crops feeds five times more people than land
where animals are kept. Our natural resources will last longer if we learn
to recycie them. The world population will not rise so quickly if people
use modern methods of birth control. Finally, if we educate people to
think about the problems we shall have a better and cleaner planet in the
future.
The greenhouse effect is a phenomenon created by the heat energy
radiated by the sun and greenhouse gases normally present in the
atmosphere which play an important part in warming the earth. The
atmosphere only permit short wave radiation pass through directly, and
absorb a part of long wave radiation,which convey heat to the
earth.joozone.com
The impact of greenhouse gases is a major factor in the
greenhouse effect. Greenhouse gases mainly include carbon dioxide,
methane and nitrous oxide. When the density of these gases increased, the
green house effect will strengthen.The sunlight passes through the
atmosphere to the land and oceans ,
in turn,the land and
oceans realease heat,or infrared radiation into the atmosphere,but lots of
this radiation is absorbed by the atmosphere. Although greenhouse gases
make up only about 1 percent of the Earth’s atmosphere,but much of this
radiation is absorbed by greenhouse gases. Besides among the greenhouse
gases the carbon dioxide becomes the controlling factor of long-term
change in the greenhouse effect.
Every coin has two sides , the development of our society comforts
us,also brings many disadvantages to us. And it is important to protect our
earth,or we we’ll be punished by the nature.
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