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
2023-09-03
60
管理
问题
If pollution continues to increase at the present rate, formation of aerosols (浮质) in the atmosphere will cause the onset of an ice age in about 50 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 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 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℃, 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 media. 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 Angles 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 50 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. Rascool 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 can be inferred from the passage?
选项
A、Environment pollution has manifested alarming threat for human survival.
B、The chance for human beings to rescue the planet is very slim.
C、Compared with aerosols, carbon dioxide is far less threatening to human beings.
D、The gloomy forecast cannot hold water if the aerosol layer is eliminated.
答案
A
解析
转载请注明原文地址:http://tihaiku.com/zcyy/2982110.html
相关试题推荐
[originaltext]Englishisalittlelikealivingthingthatcontinuestogr
[originaltext]Englishisalittlelikealivingthingthatcontinuestogr
[originaltext]Englishisalittlelikealivingthingthatcontinuestogr
Ifpollutioncontinuestoincreaseatthepresentrate,formationofaerosol
Ifpollutioncontinuestoincreaseatthepresentrate,formationofaerosol
[originaltext]M:Excuseme,mayIhavesomeinformationaboutthereceptionpar
Allthepeoplepresentattheconferenceagreedthat____________________(缺乏科学和教育
[originaltext]W:I’vejustpreparedrelevantpresentationmaterialsoftheWint
[originaltext]W:I’vejustpreparedrelevantpresentationmaterialsoftheWint
[originaltext]W:I’vejustpreparedrelevantpresentationmaterialsoftheWint
随机试题
Onecalledherbossa"bitchfromhell"whileanotheradmitted"lyingthroug
宗地图是以( )为单位编绘的地籍图。A.地图标准分幅 B.宗地 C.村
患者,男性,60岁。持续性上腹疼痛伴腰背部放射痛8小时,恶心、呕吐,吐后腹痛无减
男性,20岁。平素健康,淋雨后突发寒战、高热、头痛,第2天出现右侧胸痛、咳嗽、咳
公积金管理中心审批通过借款人的申请后,向受委托主办银行出具《委托贷款通知书》,明
影响股价变化的其他因素包括()。 ①心理因素 ②人为操纵因素 ③政策及制
小丽,13岁,初一学生,父母双亡,又无其他亲属抚养,被民政部门认定为城市“三无”
以下属于企业要素的有()A.人力、物力、财力 B.信息、知识、技术
《证券法》规定,我国证券公司的组织形式为有限责任公司或者股份有限公司,不得采取
需在两餐间服用的双膦酸盐类药物为A.阿仑膦酸钠 B.唑来膦酸钠 C.利塞膦酸
最新回复
(
0
)