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
33
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.
What is carbon dioxide in the atmosphere likened to?
选项
答案
A one-way mirror.
解析
转载请注明原文地址:https://jikaoti.com/ti/IhYMFFFM
0
大学英语六级
相关试题推荐
A、Shecouldn’tgotoSpainforholidaythissummer.B、Shecouldn’tcommunicatewithSpanishpeopleverywell.C、Shedidn’tlearn
Theethical(伦理的)behaviorinindustrializedcountrieshasbeenputunderpressure.DuringthelastyearinNorwaywehaveseenca
Itiscommonlyheldthatdrinkingmoderateamountsofalcoholcanreducetheoddsofhavingadeadlyheartattack.More(36)____
Thefeaturesoficehotelsareconstantlyevolving,asthebuildingsarereconstructedeachyear.Outsideexcursionsincludetr
Inthelate1960s’,manypeopleinNorthAmericaturnedtheirattentiontoenvironmentalproblems,andnewsteel-and-glassskysc
A、Becausethemarkethasbothupanddownyears.B、Becauseyoucangetbiggerguaranteedreturns.C、Because30%returnscanbea
A、Havinganinterview.B、Fillingoutaform.C、Talkingwithafriend.D、Askingforinformation.BM:Letmesee.1haveprintedmy
Atsometimeinyourlife,youmayhaveastrongdesiretodosomethingstrangeorterrible.However,chancesarethatyoudon’t
A、Followpolicemen’sdirections.B、Keepaneyeontheweather.C、Avoidsnow-coveredroads.D、Drivewithspecialcare.D细节题。本题询问监
随机试题
高速切削螺纹时,车削的螺纹大径应比公称尺寸大0.2~0.4mm。()
喜欢带客人到熟悉的餐馆,而且午餐总会耗掉整个下午的是()
戴阳证的表现是
在护理高血压合并左心功能不全的患者时,该患者最早出现的呼吸困难类型是
小方、小艾、小宇、小路、小黄五人参加竞选。已知:如果小方所得的选票比小艾的多,或者小宇所得的选票比小路的多,那么小黄当选。如果竞选的结果,是小宇当选,则以下哪项论断一定成立?()
我国新时期的统一战线是()。
阅读以下文字,完成以下问题。我们从何而来?仅在十年前,科学家们还一致认为大约320万年前的东非阿法种是最早的人类祖先。而2002年考古学家在西非乍得湖畔发现了一个至今有六七百万年历史的化石;他们认为这是近乎完整的人科动物头盖骨化石,该发现[]了
周清打算请一个钟点工,于是上周末她来到惠明家政公司,但公司工作人员粗鲁的接待方式使她得出结论:这家公司的员工缺乏教养,不适合做家政服务。以下哪项如果为真,最能削弱上述论证?
关于项目的人力资源管理,说法正确的是(42)。
Youshouldspendabout40minutesonthistask.Writeaboutthefollowingtopic.Somepeoplethinkmenandwomenhavedifferent
最新回复
(
0
)