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
Greenhouse Effect I.【T1】_____of the greenhouse effect A. About【T2】_______of the sunlight reaches the planet’s surface and is r
Greenhouse Effect I.【T1】_____of the greenhouse effect A. About【T2】_______of the sunlight reaches the planet’s surface and is r
admin
2022-01-23
39
问题
Greenhouse Effect
I.【T1】_____of the greenhouse effect
A. About【T2】_______of the sunlight reaches the planet’s surface and is reflected upward again as infrared radiation.
B. Infrared radiation is absorbed by【T3】______ such as water vapor, carbon dioxide, ozone and methane, etc.
C. The "greenhouse effect" helps maintain a【T4】______temperature on earth.
II. Human activities contributing to the greenhouse effect
A. Human activities【T5】______the greenhouse effect by
- creating more greenhouse gases.
-【T6】______: fewer trees to balance gases in the atmosphere.
-【T7】___________.
III. Consequences of the greenhouse effect
A. Quick increase of the【T8】__________.
B. Significant【T9】_________changes.
C. Rising【T10】______.
D. Reduced supplies of【T11】__________.
E. Extinction of many【T12】____________.
F. Influence on poor people depending on the land
G. Spreading of certain vector-borne diseases e. g. malaria.
IV. Solutions
A. To reduce greenhouse gas emissions and slow global warming by reducing dependence on【T13】_________.
B. To increase the use of【T14】___________.
C. To expand forests.
D. To have a/an【T15】__________.
【T10】
Greenhouse Effect
Good morning. Today’s lecture is about the Greenhouse Effect. The "greenhouse effect" often gets a bad rap because of its association with global warming, but the truth is we couldn’t live without it.
First, I’d like to ask you what causes the greenhouse effect? Life on earth depends on energy from the sun. About 30 percent of the sunlight that beams toward Earth is deflected by the outer atmosphere and scattered back into space. The rest reaches the planet’s surface and is reflected upward again as a type of slow-moving energy called infrared radiation. As it rises, infrared radiation is absorbed by "greenhouse gases" such as water vapor, carbon dioxide, ozone and methane, which slows its escape from the atmosphere. Although greenhouse gases make up only about 1 percent of the Earth’s atmosphere, they regulate our climate by trapping heat and holding it in a kind of warm-air blanket that surrounds the planet. This phenomenon is what scientists call the "greenhouse effect". Without it, scientists estimate that the average temperature on Earth would be colder by approximately 30 degrees Celsius, far too cold to sustain our current ecosystem.
Second, we need to clarify the ways humans contribute to the greenhouse effect. While the greenhouse effect is an essential environmental prerequisite for life on Earth, there really can be too much of a good thing. The problems begin when human activities distort and accelerate the natural process by creating more greenhouse gases in the atmosphere than are necessary to warm the planet to an ideal temperature, for example, burning natural gas, coal and oil — including gasoline for automobile engines — raises the level of carbon dioxide in the atmosphere; some farming practices and land-use changes increase the levels of methane and nitrous oxide; many factories produce long-lasting industrial gases that do not occur naturally, yet contribute significantly to the enhanced greenhouse effect and "global warming" that is currently under way. Beside, deforestation also contributes to global warming. Trees use carbon dioxide and give off oxygen in their place, which helps to create the optimal balance of gases in the atmosphere. As more forests are logged for timber or cut down to make way for farming, however, there are fewer trees to perform this critical function. Population growth is another factor in global warming, because as more people use fossil fuels for heat, transportation and manufacturing the level of greenhouse gases continues to increase. As more farming occurs to feed millions of new people, more greenhouse gases enter the atmosphere.
Ultimately, more greenhouse gases mean more infrared radiation trapped and held, which gradually increases the temperature of the Earth’s surface and the air in the lower atmosphere.
Thirdly, what are the possible consequences caused by excessive greenhouse effect? It directly results in quick increase of the average global temperature. Today, the increase in the Earth’s temperature is increasing with unprecedented speed. To understand just how quickly global warming is accelerating, consider this: during the entire 20th century, the average global temperature increased by about 0.6 degrees Celsius while by using computer climate models, scientists estimate that by the year 2100 the average global temperature will increase by 1.4 degrees to 5.8 degrees Celsius, which is rather a big leap from the last century.
Meanwhile, a majority of the scientists agree that even a small increase in the global temperature would lead to significant climate and weather changes, affecting cloud cover, precipitation, wind patterns, the frequency and severity of storms, and the duration of seasons. Rising temperatures would raise sea levels as well, reducing supplies of fresh water as flooding occurs along coastlines worldwide and salt water reaches inland. Many of the world’s endangered species would become extinct as rising temperatures changed their habitat. Millions of people would also be affected, especially poor people who live in precarious locations or depend on the land for a subsistence living. Certain vector-borne diseases carried by animals or insects, such as malaria, would become more widespread as warmer conditions expanded their range.
Finally, we need to ask ourselves what is being done and what should be done to reduce global warming. Currently, carbon dioxide accounts for more than 60 percent of the enhanced greenhouse effect caused by the increase of greenhouse gases, and the level of carbon dioxide in the atmosphere is increasing by more than 10 percent every 20 years. If emissions of carbon dioxide continue to grow at current rates, then the level of the gas in the atmosphere will likely double, or possibly even triple, from pre-industrial levels during the 21st century.
Therefore, to lessen those long-term effects, many nations, communities and individuals are taking action now to reduce greenhouse gas emissions and slow
global warming by reducing dependence on fossil fuels, increasing the use of renewable energy, expanding forests, and making lifestyle choices that help to sustain the environment. Whether they will be able to recruit enough people to join them, and whether their combined efforts will be enough to head off the most serious effects of global warming, are open questions that can only be answered by future developments.
To conclude today’s lecture, we should say it is not the greenhouse effect itself that directly leads to global warming and hence the inevitable climate changes, but the human activities that have accelerated the natural process by creating more greenhouse gases. Then, we also discussed the possible consequences caused by excessive greenhouse effect which directly results in quick increase of the average global temperature. Subsequently, global warming will lead to significant climate and weather changes, which will in turn influence living beings’ life in a long run. Finally, in order to lessen those long-term effects, a lot of people are now taking action to reduce greenhouse gas emissions and slow global warming by various ways, such as reducing dependence on fossil fuels, increasing the use of renewable energy, expanding forests, etc.
选项
答案
sea levels
解析
细节题。演讲者在讨论温室效应的后果时提到: Rising temperatures would raise sea levels as well..所以可把sea levels这一词组直接拷贝入题。
转载请注明原文地址:https://kaotiyun.com/show/0KIK777K
0
专业英语八级
相关试题推荐
Withtheincreasingdemandsofnewmedicines,animaltestingisinwidespreaduseallovertheworld.Themoralitybehindthisp
Tohelp,ornottohelp?ThathasbecomeadilemmainmodernChina.AccordingtoarecentsurveybyChinaYouthDaily,76.1perc
DaydreamingI.DaydreamingcanbeharmfulbecauseitwasconsideredasA.awasteof【T1】______【T1】______B.a【T2】______ofne
DifferentTypesofLearningI.ThedefinitionoflearningA.AprocessofpeopleexperiencingrelationshipbetweeneventsB.【T1】
Psychologistshavemanytheoriestoexplainhowwerememberinformation.Themostinfluentialtheoryisthatmemoryworksasak
【T1】______areactually【T2】______.Whiletheyare,perhaps,【T3】______tomeaningincommunicationinthesamewayasgrammaror
A、Sheownedacar.B、Shedrovewell.C、Shelikeddrivers’uniforms.D、Itwasherchildhooddream.D此题需要根据相关内容进行推理和归纳。女士说她从小就想学车,
A、Provisionofmedicalfacilities.B、Assessmentfrominternationalagencies.C、Ebolaoutpacingoperationalefforts.D、Effective
Thedebateaboutproblemdrinkingandhowtostopitnowadayscentresmostontheworking-classyoung.Theyare【M1】______highly
诸位毕业同学:你们现在要离开母校了,我没有什么礼物送给你们,只好送你们一句话罢。这一句话是:“不要抛弃学问。”以前的功课也许有一大部分是为了这张文凭,不得已而做的。从今以后,你们可以依自己的心愿去自由研究了。趁现在年富力强的时候,努力做一种专门学问。少年
随机试题
《中华人民共和国民法典》第170条规定:执行法人或者非法人组织工作任务的人员,就其职权范围内的事项,以法人或者非法人组织的名义实施的民事法律行为,对法人或者非法人组织发生效力。法人或者非法人组织对执行其工作任务的人员职权范围的限制,不得
治疗破伤风时,注射大量TAT的目的是
A.眼电图B.图形视网膜电图C.闪光视网膜电图D.视诱发电位E.眼B超反映全视网膜功能的是
与头颈部的正常发育密切相关的细胞是
突水部位发潮、滴水且滴水现象逐渐增大,仔细观察发现水中含有少量细砂属于矿井突水预兆中的()。
内资企业和外商投资企业,凡进口列入《自动许可货物管理目录》的商品而申领的自动许可证,均实行“非一批一证”管理,并在有效期内最多可使用5次。()
称呼语的运用原则不包括()。
对香烟征税时,税收主要由_______承担;对奢侈品征税时,税收主要由_______承担。
两只小白兔采蘑菇,晴天每天采32个,雨天每天采48个,已知它们一连几天一共采了336个蘑菇,平均每天采42个,那么这些天中有几天是雨天?()
有如下程序:#include<iostream>usingnamespacestd;classTestClass{public;~TestClass(){cout<<"BASE:;}};cla
最新回复
(
0
)