首页
登录
职称英语
If pollution continues to increase at the present rate, formation of aerosols
If pollution continues to increase at the present rate, formation of aerosols
游客
2025-01-04
14
管理
问题
If pollution continues to increase at the present rate, formation of aerosols in the atmosphere will cause the onset of an ice age in about fifty years’ time. This conclusion, reached by Dr. S. I. Rasool and Dr. S. H. Schneider, of the United States Goddard Space Flight Center, answers the apparently conflicting question of whether an increase in the carbon di- oxide content of the atmosphere will cause the earth to warm up or increasing the aerosol content will cause it to cool down. The Americans have shown conclusively that the aerosol question is dominant.
Two specters haunting conservationists have been the prospect that meddling with the environment might lead to the planet’s becoming unbearably hot or cold. One of these ghosts has now been laid, because it seems that even an increase in the amount of carbon dioxide in the atmosphere to eight times its present value will produce an increase in temperature of only 2(上标)C, which would take place over several thousand years. But the other problem, now looms larger than ever.
Aerosols are collections of small liquid or solid particles dispersed in air or some other medium. The particles are all so tiny that each is composed of only a few hundred atoms. Because of this they can float in the air for a very long time. Perhaps the most commonly experienced aerosol is industrial smog of the kind that plagued London in the 1950s and is an even greater problem in Los Angeles today. These collections of aerosols reflect the sun’s heat and thereby caused the earth to cool.
Dr. Rasool and Dr. Schneider have calculated the exact effect of a dust aerosol layer just above the earth’s surface on the temperature of the planet. As the layer builds up, the present delicate balance between the amount of heat absorbed from the sun and the amount radiated from the earth is disturbed. The aerosol layer not only reflects much of the sun’s light but also transmits the infrared radiation from below almost unimpeded. So, while the heat input to the surface drops, the loss of heat remains high until the planet cools to a new balanced state. Within fifty years, if no steps are taken to curb the spread of aerosols in the atmosphere, a cooling of the earth by as much as 3.5。C seems inevitable. If that lasts for only a few years, it would start another ice age, and because the growing ice caps at each pole would themselves reflect much of the sun’s radiation, it would probably continue to develop even if the aerosol layer were destroyed.
The only bright spot in this gloomy forecast lies in the hope expressed by Dr. Rasool and Dr. Schneider that nuclear power may replace fossil fuels in time to prevent the aerosol content of the atmosphere from becoming critical. [br] What might avert the danger of the building up of a high concentration of aerosols?
选项
A、Nuclear power.
B、Fossil fuels.
C、Carbon dioxide.
D、Atom bombs.
答案
A
解析
根据最后一段中的“…nuclear power may replace fossil fuels in time to prevent the aerosol content of the atmosphere from becoming critical”,就可以断定[A]为正确答案,
转载请注明原文地址:https://www.tihaiku.com/zcyy/3898605.html
相关试题推荐
Ifpollutioncontinuestoincreaseatthepresentrate,formationofaerosols
Ifpollutioncontinuestoincreaseatthepresentrate,formationofaerosols
Atpresentcompaniesandindustriesliketosponsorsportsevents.Tworeason
Atpresentcompaniesandindustriesliketosponsorsportsevents.Tworeason
Atpresentcompaniesandindustriesliketosponsorsportsevents.Tworeason
Atpresentcompaniesandindustriesliketosponsorsportsevents.Tworeason
Atpresentcompaniesandindustriesliketosponsorsportsevents.Tworeason
Atpresentcompaniesandindustriesliketosponsorsportsevents.Tworeason
By______itismeantthatsomethingrepresentssomethingelse.A、soundB、utteranc
[originaltext]TheU.S.governmenthasreleasednewinformationaboutJoseP
随机试题
()稀奇古怪的实验()美术[br]()传统的方法()文学、戏剧(A)
Whatistheappropriatetitleforthepassage?[br]AccordingtoLarson,toredr
WhoistryingtotoppletheAssadgovernment?[originaltext]TheWhiteHousesays
Forthispart,youareallowed30minutestowriteanessayentitledOnFantasy
已知f(x)在x=a处可导,且f′(a)=k(k≠0),则( )。A.k/3
唾液分泌调节不包括A.唾液分泌能建立条件反射 B.副交感神经兴奋时唾液分泌增加
患者,男,50岁。慢性支气管炎急性发作。咳嗽气粗,咳痰不爽,胸胁胀满,面赤,舌红
流行性腮腺炎可出现腮腺管开口处黏膜红肿,其部位在A.上颌第2臼齿相对应的颊黏膜上
简论马锡五审判方式。
A.更昔洛韦 B.四环素可的松 C.利巴韦林 D.氯霉素 E.碘苷精神病
最新回复
(
0
)