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
47
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】__________.
【T7】
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
population growth
解析
细节题。可以根据讲座相关内容"Population growth is another factor in global warming, because as more people use fossil fuel.."直接拷贝入题。
转载请注明原文地址:https://kaotiyun.com/show/vKIK777K
0
专业英语八级
相关试题推荐
(1)ConsideringhowjazzistranscribedinChinese(jueshi),youmaybemisledintoassumingthatitisanaristocraticcultural
A、Becausesomeofthemarenotusedtosomekindsofalcohol.B、Becausemostofthemdrinkfewertimesthanpeopleofothercont
(1)Ifyouwanttoseewhatittakestosetupanentirelynewfinancialcenter(andwhatisbestavoided),headforDubai.This
A、Gethelpfuladviceonpotentialjobs.B、Learnpracticalskillsofthefuturejob.C、Askforhigherstartingsalaries.D、Sendo
DifferentTypesofLearningI.ThedefinitionoflearningA.AprocessofpeopleexperiencingrelationshipbetweeneventsB.【T1】
EffectiveNote-takingThedifficultyoftakingnotes:Note-takingrequiresahighlevelofabilityduetothe【T1】______ofspoke
A、Unsuccessful.B、Gradual.C、Frustrating.D、Passionate.B推理判断题。本题考查Maggie对于选择职业方向的看法。听力材料中Maggie提及It’sagradualprocessthatinv
A、Howtomakeacake.B、Howtomakeomelets.C、Toacceptwhatistaught.D、Toplanafuturecareer.C推理判断题。本题考查Maggie的妈妈所面临的最大挑战
A、Protection.B、Imagination.C、Excitement.D、Encouragement.D细节理解题。本题考查Maggie与妈妈一起学习的最大好处是什么。听力材料中提到Thaturgesmetostudyharder
A、Havingroommates.B、Practicingcourttrials.C、Studyingtogether.D、Takingnotesbyhand.D细节理解题。本题考查母女二人作为学生的共同之处。听力材料中提到Ass
随机试题
以下哪项不是乳房肥大缩小术的并发症
荧光显微镜的光源是
某女士,27岁,已婚,自述白带增多,外阴瘙痒伴灼热感1周。检查:阴道黏膜充血,有散在红色斑点,白带呈黄色泡沫状,质稀薄,有腥臭味。给此病人阴道灌洗选择的溶液是()。
具有凉肝息风,增液舒筋作用的方药是
下列不属于心包穿刺的指征是
依据《突发事件应对法》,国家将自然灾害、事故灾害和公共卫生事件预警分为一级、二级、三级和四级,分别用()标示,一级为最高级别。
关于团队奖励计划的说法,正确的是()。
绘制直方图时,对数据的数量有一定的要求,具体包括()。
上古婴儿出生()个月后由父亲命名。一般男子20岁举行成人礼、女子15岁举行许嫁礼时取字。
“真理与谬误的对立,只有在非常有限的范围内才有意义。”这种观点属于()
最新回复
(
0
)