首页
登录
职称英语
If pollution continues to increase at the present rate, formation of aerosol
If pollution continues to increase at the present rate, formation of aerosol
游客
2023-09-11
17
管理
问题
If pollution continues to increase at the present rate, formation of aerosols (悬浮微粒) in the atmosphere will cause the onset (开始) of an ice age in about fifty years’ time. This conclusion, reached by Dr. S. Rasool and Dr. H. Schneider of the United States Goddard Space Flight Centre, answers the apparently conflicting questions of whether an increase in the carbon dioxide 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 environmental pollution 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℃. 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 cause 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 in 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. 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 stop the spread of aerosols in the atmosphere, a cooling of the Earth by as much as 3.5℃ 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] The only way to stop the spread of aerosols in the atmosphere, according to Dr. Rasool and Dr. Schneider, is to use ______.
选项
A、fossil fuels
B、electric power
C、nuclear energy
D、coal power
答案
C
解析
细节题。根据最后一段,两位博士认为防止大气中悬浮颗粒情况变得危急的希望在于及时用原子能取代矿物能源。
转载请注明原文地址:https://tihaiku.com/zcyy/3003864.html
相关试题推荐
[originaltext]W:Hi,Bob.Haveyougivenyouroralpresentationperformancein
Aftermorethan40yearsofparalleldevelopment,theinformationandlife
Aftermorethan40yearsofparalleldevelopment,theinformationandlife
Aftermorethan40yearsofparalleldevelopment,theinformationandlife
Aftermorethan40yearsofparalleldevelopment,theinformationandlife
Aftermorethan40yearsofparalleldevelopment,theinformationandlife
Aftermorethan40yearsofparalleldevelopment,theinformationandlife
Aftermorethan40yearsofparalleldevelopment,theinformationandlife
Inrecentyears,therehasbeenabigincreaseinairtravelandmanylarge
Inrecentyears,therehasbeenabigincreaseinairtravelandmanylarge
随机试题
SirMartinSorrell,thechiefexecutiveoftheadvertisingconglomerateWPP,
[originaltext]ChancelloroftheExchequerGordonBrownhasurgedrich,oil-p
白朴所写的《墙头马上》是一部()A.爱情喜剧 B.历史剧 C.神仙道化剧
软件测试的原则不包括()。A.测试应在软件项目启动后尽早介入 B.测试工
关于隧道超前地质预报中高分辨直流电法的相关描述,表述正确的有()。A.以岩石的
合伙型股权投资基金,新增合伙人需(??)一致同意,并订立入伙协议。A.全体合伙人
共用题干 第三篇TheAgeofbeingBulliedandIt
赵大姐的丈夫去世后,留下一对双胞胎儿子和几十万元的债务。在与社会工作者的初次接触
集体合同的主件是( ),其内容涵盖劳动关系的各个方面。A.集体协议 B.综合
采用工程量清单计价的项目,竣工结算编制的主要内容有()。A、规费项目 B、所
最新回复
(
0
)