首页
登录
职称英语
Climatic conditions are delicately adjusted to the composition of the Earth’
Climatic conditions are delicately adjusted to the composition of the Earth’
游客
2025-04-22
34
管理
问题
Climatic conditions are delicately adjusted to the composition of the Earth’s atmosphere. If there were a change in the atmosphere for example, in the relative proportions of atmosphere gases the climate would probably change also. A slight increase in water vapor, for instance, would increase the heat-retaining capacity of the atmosphere and would lead to a rise in global temperatures. In contrast, a large increase in water vapor would increase the thickness and extent of the cloud layer, reducing the amount of solar energy reaching the Earth’s surface.
The level of carbon dioxide, CO2, in the atmosphere has an important effect on climatic change. Most of the Earth’s incoming energy is short wavelength radiation, which tends to pass through atmospheric CO2 easily. The Earth, however, reradiates much of the received energy as a long wavelength radiation, which CO2 absorbs and then remits toward the Earth. This phenomenon, known as the greenhouse effect, can result in an increase in the surface temperature of a planet. An extreme example of the effect is shown by the Venus, a planet covered by heavy clouds composed mostly of CO2, whose surface temperatures have been measured at 430℃. If the CO2 content of the atmosphere is reduced, the temperature falls. According to one respectable theory, if the atmospheric CO2 concentration were halved, the Earth would become completely covered with ice. Another equally respectable theory, however, states that a halving of the CO2 concentration would lead only to a reduction in global temperatures of 3℃. If, because of an increase in forest fires or volcanic activities, the CO2 content of the atmosphere increased, a warmer climate would be produced. Plant growth, which relies on both the warmth and the availability of CO2, would probably increase. As a consequence, plants would use more and more CO2. Eventually CO2 levels would diminish and the climate, in turn, would become cooler. With reduced temperatures many plants would die; CO2 would thereby be returned to the atmosphere and gradually the temperatures would rise again. Thus, if this process occurred, there might be a long-term oscillation in the amount of CO2 present in the atmosphere, with regular temperature increases and decreases of a set magnitude.
Some climatologists argue that the burning of fossil fuels has raised the level of CO2 in the atmosphere and has caused a global temperature rise of at least 1℃. But a supposed global temperature rise of 1℃ may in reality be only several regional temperature increases, restricted to areas where there are many meteorological stations and caused simply by shifts in the pattern of atmospheric circulation. Other areas, for example, the Southern Hemisphere oceanic zone, may be experiencing an equivalent temperature decrease that is unrecognized because of the shortage of meteorological recording stations. [br] The author refers to the Venus primarily in order to ______.
选项
A、show the inherent weakness of the greenhouse effect theory
B、show that the greenhouse effect works on other planets but not on the Earth
C、show the extent to which Earth’s atmosphere differs from that of the Venus
D、support the argument that the CO2 level in the atmosphere has a significant effect on climate
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/4049440.html
相关试题推荐
Inthispartyouarerequiredtowriteacompositionentitled"MyViewonTe
ClimaticconditionsaredelicatelyadjustedtothecompositionoftheEarth’
ClimaticconditionsaredelicatelyadjustedtothecompositionoftheEarth’
A、conditionsB、situationsC、occasionsD、instancesC四个选项的意思是:A项conditions“条件,社会地位
UnlikethecarefullyweighedandplannedcompositionsofDante,Goethe’swri
UnlikethecarefullyweighedandplannedcompositionsofDante,Goethe’swri
Badtravelingconditionshadseriously______theirprogresstotheirdestination
Writeacompositionofatleast250wordsbasedonthetitle"CanMoneyBuyHapp
Itisnotlongsinceconditionsinthemineswereworsethantheyarenow.T
Itisnotlongsinceconditionsinthemineswereworsethantheyarenow.T
随机试题
[audioFiles]audio_eufm_j17_001(20082)[/audioFiles]A、Presentanewbooktothec
劳务培训计划的编制原则包括()。A.注重全程性原则 B.理论与实践相结合的原
道氏理论所认为的主要趋势的持续时间一般在()。A.1年或1年以上 B.
一种分子包嵌在另一种分子的空穴结构中而形成的包合体是A.微丸 B.微球 C.
2020年,F省全年粮食产量502.32万吨,比上年增加8.42万吨,增长1.7
按管理层次不同对商业信息的分类不包括()。A:操作层信息 B:管理层信息 C
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
西域都护
Inthearticle,theword“course”inpar
下列选项中,属于建筑施工企业取得安全生产许可证应当具备的安全生产条件是( )。
最新回复
(
0
)