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
There are hidden factors which scientists call "feedback mechanisms". No one knows quite how they will interact with the changin
There are hidden factors which scientists call "feedback mechanisms". No one knows quite how they will interact with the changin
admin
2011-03-26
34
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.
We can learn from the passage that ______.
选项
A、some feedback mechanisms may stow down global warming
B、the basic facts of global warming are unknown
C、developing countries benefit from cheap fossil fuels
D、developed countries have decided to reduce their energy consumption
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/1YBO777K
0
考博英语
相关试题推荐
WorriedSpanishlemongrowershave(29)upaspecialcommissiontotryto(30)theproblemsofadecliningmarketandcompet
Questions41-45•Readthememoandletterbelow.•Completetheform.•Writeawordorphrase(inCAPITALLETTERS)or
Whicharrangementistakingplaceatthetimethatwasplanned?
•Lookatthefollowingmembersofacompany.Itshowsdifferentjobsandposition.•Forquestions6-10,decidewhichperson(A
•Readthearticlebelowaboutasuccessfulcompany.•Foreachquestion23-28ontheoppositepage,choosethecorrectanswe
Readthereportbelowaboutthegrowthoflow-costairlines.ChoosethecorrectwordtofilleachgapfromA,BorContheoppo
Language,likefood,isabasichumanneedwithoutwhichachildatacriticalperiodoflifemightbe______anddamaged.
Sometelevisionprogramshavetobefundamentallychangedonaccountofanindustrial______.
Wemadeplansforavisit,but______difficultieswithcarpreventedit.
随机试题
简述幼儿园与社区合作存在的问题。
净利润就是利润总额扣除()后的净额。
A/胰岛素B/阿卡玻糖C/格列齐特D/甲苯磺丁脲E/地巴唑又可称为D860的药物是
对于水闸下游翼墙的单侧扩散角,下列说法正确的是()。
关于开放式基金,下列表述错误的是()。
根据企业所得税法的规定,企业购买并实际使用符合条件的专用设备,可按该专用设备投资额的10%从企业当年的应纳税额中抵免,该设备应符合的条件是()。
工程合同谈判一般可由()组成。
“吴带当风”是指谁的艺术风格()。
设,x∈(0,+∞),证明:(1)f(x)在其定义域内单调增加;(2)
一位教师赞扬一位学习成绩不好学生的演出服装很漂亮,并说:“我对你们的爱不是用身高、体重和成绩来衡量的,我有足够的爱去疼爱每个学生。”这属于教师在沟通时注重了()。
最新回复
(
0
)