首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
In the atmosphere, carbon dioxide acts rather like a one-way mirror the glass in the roof of a greenhouse which allows the sun’s
In the atmosphere, carbon dioxide acts rather like a one-way mirror the glass in the roof of a greenhouse which allows the sun’s
admin
2010-04-30
69
问题
In the atmosphere, carbon dioxide acts rather like a one-way mirror the glass in the roof of a greenhouse which allows the sun’s rays to enter but prevents the heat from escaping.
According to a weather expert’s prediction, the atmosphere will be 3℃ warmer in the year 2050 than it is today, if man continues to bum fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several meters and severely flooding coastal cities. Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere, possibly resulting in an alteration of the Earth’s chief food-growing zones.
In the past, concern about a man-made warming has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming: in other words, by a warming on the scale that will possibly take place in the next 50 years from the burning of fuels.
Satellite pictures show that large areas of Antarctic Ice are already disappearing. The evidence available suggests that a warming has taken place. This fits the theory that carbon dioxide warms the Earth.
However, most of the fuel is burnt in the northern hemisphere where temperatures seem to be falling. Scientists conclude, therefore, that up to now natural influence on the weather have exceeded those caused by man. The question is: Which natural cause has most effect on the weather?
One possibility is the variable behavior of the sun. Astronomers at one research station have studied the hot spots and "cold" spots (that is, the relatively less hot spots) on the sun. As the sun rotates, every 27.5 days, it presents hotter or "colder" faces to the Earth, and different aspects to different parts of the Earth. This seems to have a considerable effect on the distribution of the Earth’s atmospheric pressure, and consequently on wind circulation. The sun is also variable over a long term: Its heat output goes up and down in cycles, the latest trend being downward.
Scientists are now finding mutual relations between models of solar weather interactions and the actual climate over many thousands of years, including the last Ice Age. The problem is that the models are predicting that the world should be entering a new Ice Age and it is not. One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia (惯性) of the Earth’s climate. If this is right, the warming effect of carbon dioxide might thus be serving as a useful counter-balance to the sun’s diminishing heat.
If the assumption about the delay of a new Ice Age is correct, what might the warming effect of carbon dioxide be functioning as?
选项
答案
A useful counter-balance to the sun’s diminishing heat.
解析
转载请注明原文地址:https://kaotiyun.com/show/UfOK777K
0
大学英语六级
相关试题推荐
A、TootherEuropeancountries.B、Totheremoteareasandsuburbs.C、Tothenaturalparksforbirds.D、Backtotheirnests.BWher
TheOlympictorchstartsitsjourneyaroundtheworldfromtheopeningceremonyofOlympicGames.TheworldrestartedtheOlymp
Theethical(伦理的)behaviorinindustrializedcountrieshasbeenputunderpressure.DuringthelastyearinNorwaywehaveseenca
A、Allsoftwarepackagesaremadebythesamesoftwarecompany.B、Theusersarefamiliarwithallkindsofsoftwarepackages.C、T
Accuraterepresentationandreportingisvitalinthemediabecause______.InLine4,Para.3,theword"exacerbated"ismost
A、Shehasbadstudyhabits.B、Shesleepstoomuch.C、Shewakesuplate.D、She’sanexcellentstudent.AW:I’mexhausted.Istaye
A、Itisaseriousthroattoitscompetitors.B、Itisnotpowerfulenoughtoaffecttheworldmarket.C、Thecars’qualityisgood
A、It’satraditionalEuropeanfestival.B、ItfallsonthedaybeforeEaster.C、Thetraditionalcelebrationisdecoratingeggs.D
ManyAsiantouristsdarenotgotoThailandsincethetsunamiin2004becauseoftheirWhatothermethodisusedtohelpoverco
A、Sheishavingdinner.B、Sheiswaitingforatelephonecall.C、Sheislisteningtomusic.D、Sheiscookingdinner.D女士说要查看一下晚饭
随机试题
维果斯基认为,儿童有两种发展水平:一是儿童的现有水平,二是即将达到的发展水平。最近发展区就是在这两种水平之间的()。
男性,65岁,健康体检发现右肺上部直径2cm占位病灶,无自觉症状,拟诊肺癌。到门诊咨询,哪种肺癌手术效果较好
下列哪项属于高危家庭
下列关于胆色素的叙述,正确的是
根据《物权法》,土地承包经营权属于()。[2014年真题]
小丁说:“只要高局长过目,2006年年度统计报告就不会出错。”小陈说:“如果我和小丁认真负责,高局长就不要过目。”小马说:“高局长审过了2006年统计报告,他一眼就看出其中一个统计数字有问题。”假如三人中有一人说错并且高局长确实看过2006年统计报告,那么
某日.一位上车不久的乘客发现手提袋被人割开,装在里面的2000元钱不见了。乘客说上车前手提袋还是好的,因当时还没有人下车,于是司机把车开到附近的派出所。经过调查寻找.发现2000元已被扒手扔在椅子下面。嫌疑人有甲、乙、丙、丁。甲说:“反正不是我干的。”乙
爸爸比女儿大33岁,他的年龄正好是女儿的4倍;女儿和她妈妈的年龄加一起正好为50岁,那么妈妈今年()岁。
OnesillyquestionIsimplycannottolerateis"Howdoyoufeel?"Usuallythequestionisaskedofamaninaction—amanwalking
Whatdoesthespeakerreportabouttheheatwave?
最新回复
(
0
)