首页
登录
职称英语
In the atmosphere, carbon dioxide acts rather like a one-way mirror—the glass
In the atmosphere, carbon dioxide acts rather like a one-way mirror—the glass
游客
2025-01-15
9
管理
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 burn 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 earth’s chief food-growing zones. In the past, concern about a man-made warming of the earth 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 fifty 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 influences 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 of the earth’s climate. If this is tight, the warming effect of carbon dioxide might thus be serving as a useful counter-balance to the sun’s diminishing heat. [br] If the assumption about the delay of a new Ice Age is correct, ______.
选项
A、the best way to overcome the cooling effect would be to bum more fuels
B、ice would soon cover the northern hemisphere
C、the increased levels of carbon dioxide in the atmosphere could warm up the earth even more quickly
D、the greenhouse effect could work to the advantage of the earth
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3913672.html
相关试题推荐
[originaltext]Haveyoueverheardofbungeejumping?Itisaratherthrilli
[originaltext]Haveyoueverheardofbungeejumping?Itisaratherthrilli
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglass
Thisbookconcentratesratheronproductsoringredients,whichareaddedto
Thisbookconcentratesratheronproductsoringredients,whichareaddedto
Thisbookconcentratesratheronproductsoringredients,whichareaddedto
Thisbookconcentratesratheronproductsoringredients,whichareaddedto
TheatmospherethatoriginallysurroundedEarthwasprobablymuchdifferent
TheatmospherethatoriginallysurroundedEarthwasprobablymuchdifferent
TheatmospherethatoriginallysurroundedEarthwasprobablymuchdifferent
随机试题
______wearrivedinamoreurbanarea,whereJimtookmetoaplacecalledBosto
ShoppinghabitsintheUnitedStateshavechangedgreatlyinthelastquarter
Inthe1990s,DemiMoorewasamajormoviestarand,asthewifeofBruceWi
Theidealcompanionmachinewouldnotonlylook,feel,andsoundfriendlybu
[originaltext]W:Doyouhavethepaperbackeditionofthisbook.Ithinkit’ll
某新建高速公路土方路基路床施工中,其中某路段压实层质量检查的压实度 检测结果如
对于“真诚不等于说实话”,理解不正确的是()A.表达真诚应有助于来访学生的成长
280)发信机发出的信号电平,经通道衰减到达对侧收信机入口时,应有足够的余量。一
男性,33岁,10年来阵发性心悸,每次心悸突然发作,持续30min至3小时不等
患者男,62岁。上颌义齿使用2年,近感义齿松动,有食物滞留基托内,咀嚼时痛,昨日
最新回复
(
0
)