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
2024-06-05
30
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] We learn from the third paragraph that ______.
选项
A、London was plagued with rats in the 1950s
B、London is covered with smog today
C、London was polluted by smog in the 1950s
D、Los Angeles is as heavily polluted today as London was in the 1950s
答案
C
解析
推理题。根据第三段第四句,伦敦曾在50年代遭受工业烟雾危害。
转载请注明原文地址:https://tihaiku.com/zcyy/3620128.html
相关试题推荐
[originaltext]W:Ican’tbeartheairpollutioninthiscityanymore.It’sgett
[originaltext]W:Ican’tbeartheairpollutioninthiscityanymore.It’sgett
Theresultofautomationmaywellbeanincreaseinemployment,sinceitis
Theresultofautomationmaywellbeanincreaseinemployment,sinceitis
Theresultofautomationmaywellbeanincreaseinemployment,sinceitis
Theresultofautomationmaywellbeanincreaseinemployment,sinceitis
Theresultofautomationmaywellbeanincreaseinemployment,sinceitis
Theresultofautomationmaywellbeanincreaseinemployment,sinceitis
Theresultofautomationmaywellbeanincreaseinemployment,sinceitis
[originaltext]W:Hi,Bob.Haveyougivenyouroralpresentationperformancein
随机试题
MoviesarethemostpopularformofentertainmentformillionsofAmericans
Thecash-for-clunkersprogramturnedouttobeaboonforAsianautomakersa
以下关于SWOT分析方法的说法中,不正确的是( )。A.O代表机遇 B.W代
晚期肝硬化最严重的并发症是A.肝性脑病 B.原发性肝癌 C.上消化道出血
下列关于基金销售适用性实施保障的说法错误的是()。A.基金销售机构总部应当
下列各项中,不符合内部牵制的要求的是()。A、出纳人员管票据 B、出纳人员
百合固金汤的君药是A.地黄、熟地黄B.百合、麦冬C.地黄、麦冬D.玄参、麦冬E.
Ⅲ型高脂蛋白血症载脂蛋白变化正确的是A.CⅡ↓,CⅢ十E↑↑B.CⅡ↑,CⅢ↓E
桥本甲状腺炎是A.自身免疫性疾病B.细菌感染性疾病C.病毒感染性疾病D.碘缺乏性
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
最新回复
(
0
)