2024年3月1日发(作者:手指倒刺)
Caus of Global Warming
Global warming is the increa in the average temperature of the earth’s
near-surface air and oceans since the mid-20th century. According to the 2007 Fourth
Asssment Report, global surface temperature had incread by approximately 0.74
degrees Celsius. Global warming could give ri to many adver effects to human
life and ecology, even the extinction of many creatures. Thus, it is high time that we
realized the caus of this phenomenon. The caus of global warming can be roughly
divided into natural one and man-made ones. Man-made caus include
overpopulation, industrialization, and the lack of undertaking responsibilities of
governments.
Firstly, the natural climate changes bring about a warm environment. According
to Xinhua News Agency, meteorologists revealed that the climate system of the earth
is undergoing an natural change characterized by global warming. Global climate has
fluctuated since 10,000 years ago, alternated by warm and cold periods regularly,
which is influenced by the shape of earth’s revolving orbit. Since the middle of the
19th century the orbit has been turning from elliptical to round. Therefore, the distance
between the sun and the earth is reducing so that much more heat is radiated from the
sun to the earth.
Secondly, human activities contribute a lot to global warming, becau of the
large amount of carbon dioxide being created. Carbon dioxide is the gas belonging to
greenhou gas leading to greenhou effect, which is a main cau of global
warming. Carbon dioxide and the other greenhou gas absorb radiation heat from
the sun and keep it from running out of the atmosphere, warming up the earth’s lower
atmosphere and surface. Overpopulation comes first in man-made caus. In the
conquence of better life conditions and medical progress, global population has
boomed at a staggering rate. The greater the population, the larger the amount of
consumption of food, raw materials and in turn, the higher emission of carbon dioxide.
More livestock which relea large amounts of carbon dioxide, are being raid to
meet people’s increasing need of food. In addition, as people need wood for human
activities such as making furniture, deforestation is becoming rious. Less
plantations reduce the absorption of carbon dioxide, further more causing the
imbalance of ecological system and decreasing the ability of earth to adjust itlf, and
tho are worning the global warming situation. Besides, human beings are a large
group creating carbon dioxide through respiration.
Industrialization is the cond man-made cau resulting in global warming.
Since the first industrial revolution of the 19th century, people have stepped into an
age of machines. Whether in industrialized nations or emerging nations, cars and
machines are made in mass-productions, who emissions including various
greenhou gas such as carbon dioxide, methane, nitrous oxide, etc. Statistics show
that since cars have been invented, the concentrations of carbon dioxide and methane
have incread by 36% and 148% respectively. On the other hand, mushrooming
factories burn a lot of fossil fuels to obtain energy and support their production,
producing about three-quarters of the increa in carbon dioxide over the past 20
years. To pursue economic growth and high standards of living, more and more
factories have been built, among which exist a large portion of factories living on over
consumption of fuel. If not controlled effectively, the situation may get wor.
Lastly, an unwillingness of most countries’ governments to cooperate to control
the situation is an important factor. Global warming is an international problem in
scope, and an international effort is required to solve the problem. However, many
difficulties are in the way of collaboration. Many governments try to shirk their
country’s responsibilities of reducing the emissions to be exempt from energy
conrvation and economic sacrifice. Becau individual nations will act according to
their short-term motives and lf-interest, it is hard for them to compromi and make
sacrifices to reach a final agreement. Thus, many problems of global warming still
remain to be solved.
In conclusion, global warming results from various caus which consist of
natural reason and man-made reasons. Natural climate changes are creating a warmer
environment for the earth, and overpopulation and industrialization are the main
resources of greenhou gas, intensifying the status quo greatly. In addition, it
appears that an international cooperation is needed to deal with global warming.
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