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
2023-12-18
30
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://tihaiku.com/zcyy/3284047.html
相关试题推荐
[originaltext]W:Asthecomicindustrycontinuesitspainfulmetamorphosisinto
Atpresentcompaniesandindustriesliketosponsorsportsevents.Tworeaso
USA/IranSir,Thepresentquar
TheUniversityintransformation,editedbyAustralianfuturistsSohailInay
TheHeadofSlateofCanadaisrepresentedby______.A、theMonarchB、thePreside
【B1】[br]【B5】accepted→presented/realized由上下文可知,这句话的意思是美国从英国独立出来时,有的提议说要从语言上进行或实
ThePopularityofEnglishⅠ.PresentstatusofEnglishA
WhichofthefollowingisNOTtrueoftheUnitedNations?[br]Thepresentrefor
【B1】[br]【B8】enlarge改成increase本题辨析enlarge和increase。尽管enlarge和increase是近义词,都有“增加
______istheoutstandingrepresentativeofAestheticisminBritishliteratureh
随机试题
Howdidthestudentgettheuniversityprospectus?[br]Whodecidesthecountry
Massivechangesinalloftheworld’sdeeplycherishedsportinghabitsare
Theproducersofinstantcoffeefoundtheirproductstronglyresistedinthe
排版单位根据初校样上的校改标注进行修改后,再次打印出来提交出版单位的校样是()
计算机的三大应用领域是A.科学计算、信息处理和过程控制 B.计算、打字和家教
梅毒牙常见于A. B. C. D. E.
距离保护二段保护范围是()。 (A)不足线路全长; (B)线路全长延伸至
根据以下资料 21世纪头10年,金砖国家整体经济平均增长率超过8%,远高于发达
关于阿米巴肝脓肿的叙述,下列哪项是错误的? A.阿米巴滋养体一般经肠壁淋巴管进
初产妇,32岁,剖宫产一男活婴,产后1周,寒战、高热,左下肢持续性疼痛1天,恶露
最新回复
(
0
)