首页
登录
职称英语
There are hidden factors which scientists call "feedback mechanisms". No one
There are hidden factors which scientists call "feedback mechanisms". No one
游客
2025-05-07
29
管理
问题
There are hidden factors which scientists call "feedback mechanisms". No one knows quite how they will interact with the changing climate. Here’s one example: plants and animals adapt to climate change over centuries. At the current estimate of half a degree centigrade of warming per decade, vegetation may not keep up. Climatologist James Hansen predicts climate zones will shift toward the poles by 50 to 75 kilometers a year--faster than trees can naturally migrate. Species that find themselves in an unfamiliar environment will die. The 1000-kilometer-wide strip of forest running through Canada, Russia, and Scandinavia could be cut by half. Millions of dying trees would soon lead to massive forest fires, releasing tons of CO2 and further boosting global warming.
There are dozens of other possible "feedback mechanisms". Higher temperatures will fuel condensation and increase cloudiness, which may actually damp down global warming. Others, like the "albedo" effect is the amount of solar energy reflected by the earth’s surface. As northern ice and snow melts and the darker sea and land pokes through, more heat will be absorbed, adding to the global temperature increase.
Even if we were to magically stop all greenhouse-gas emissions tomorrow the impact on global climate would continue for decades. Delay will simply make the problem worse. The fact is that some of us are doing quite well the way things are. In the developed world prosperity has been built on 150 years of cheap fossil fuels.
Material progress has been linked to energy consumption. Today 75 percent of all the world’s energy is consumed by a quarter of the world’s population. The average rich-world resident adds about 3.2 tons of CO2 yearly to the atmosphere, more than four times the level added by each Third World citizen. The US, with just seven percent of the global population, is responsible for 22 percent of global warming. [br] Which of the following is the main topic of the passage?
选项
A、Impact of global warming on climate
B、Prosperity and cheap fossil fuels
C、Material progress and energy consumption
D、Plants and animals in the changing climate
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/4065607.html
相关试题推荐
Scientistshaveknownformorethantwodecadesthatcancerisadiseaseof
Scientistshaveknownformorethantwodecadesthatcancerisadiseaseof
Scientistshaveknownformorethantwodecadesthatcancerisadiseaseof
TheNaturecommentarysaysscientistsworkingonagingnowhavetoA(takeintoa
Hiddenhotelcostscanbeasourceoffrustrationtothefrugaltraveler.A、caref
Therearehiddenfactorswhichscientistscall"feedbackmechanisms".Noone
Therearehiddenfactorswhichscientistscall"feedbackmechanisms".Noone
Price______isatthetopofthefactorscontributingtotheriseofconstructi
Modernscientistsholdthattruthisnotsomethingthatwefirst______andthen
Keysshouldneverbehiddenaroundthehousesincethieves______knowwhereto
随机试题
Lookingbackonmychildhood,Iamconvincedthatnaturalistsarebornandno
[originaltext]M:I’llcallyouifyougivemeabusinesscard.W:I’msorry,bu
下列技术分析方法中,被认为能提前很长时间对行情的底和顶预测的是( )A.形态类
下列选项中,符合所给图形的变化规律的是()。 A.如上图所示 B.如上图
A.玄参、贝母、牡蛎B.大黄、黄连、礞石C.黄连、半夏、栝楼实D.大黄、黄芩、礞
土建设施精益化评价细则中要求:推拉窗有防跌落措施和()。限位器$;$限制器
11.高压室的钥匙至少应有3把,由()负责保管,按值移交。1把专供紧急时使
()是继2岁之后正常儿童出现强迫现象的又一高峰年龄。A.3~4岁 B.5
产品责任险的理赔应做到()。A.超保单限额的诉讼抗辩费用不予赔付 B.被保险
下列关于企业合并的说法中,正确的有( )。 A.企业合并的结果通常是一个企业
最新回复
(
0
)