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
32
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.
"Feedback mechanisms" in paragraph 1 most probably refer to ______.
选项
A、how plants and animals adapt to hidden factors
B、how plants and animals interact with the changing climate
C、how climate changes
D、how climate zones shift
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/mYBO777K
0
考博英语
相关试题推荐
•Readthefollowingpassagebelowaboutthefactorsthatinfluencebuyingbehavior.•Foreachquestion(23-28),choosethecor
•Lookatthechartbelow.ItshowsgrowthofChina’sGDP,exportandimportvolumes.•Whichyeardoeseachsentence(11-15)
Thepositionwillsuitanindividualwithinternationalsalesexperienceparticularlythroughadistributornetwork.
TheUnitedStatescourtsystemischaracterizedby______hierarchies:therearebothstateandfederalcourts.
Themantoldmeunderrosethatheoftentooktroubleonyouraccount.
Perhapsallcriminalsshouldberequiredtocarrycardswhichread:Fragile;HandlewithCare.Itwillneverso,thesedaystog
Theprocessbymeansofwhichhumanbeingsarbitrarilymakecertainthingsstandforotherthingsmaybecalledthesymbolicpro
Theprocessbymeansofwhichhumanbeingsarbitrarilymakecertainthingsstandforotherthingsmaybecalledthesymbolicpro
美国的经济体制主要是围绕着私人企业和以市场为导向而建立起来的,在这种经济中,消费者们在很大程度上通过他们在市场上花钱购买他们最需要的货物和设施来决定厂家该生产什么。
Hewasnot______andpreferredtobealonemostofthetime.
随机试题
什么叫做数字证书?常见的数字证书可以分成哪几类?
普通合伙企业的新合伙人对入伙前的合伙企业债务承担________。普通合伙企业的退伙人应对退伙前合伙企业发生的债务承担________。
在以下打印机中,打印速度最快的是()
A、镇痛作用B、抗癌活性C、抗菌消炎作用D、抗中毒性休克作用E、具有拟胆碱作用;与上述生理活性相对应的生物碱是黄连中的小檗碱
A、图像视觉的非线性校正B、图像插补处理C、信号动态范围的对数变换D、工作站图文处理E、三维重建属于前处理的
患者女,35岁,主诉心悸、怕热、神经过敏、失眠。护士评估发现病人手有震颤,肌无力,皮肤温暖湿润,心动过速。这个病人最可能的诊断是
某冶炼厂为扩大生产修建一座新厂房。在施工过程中遇到多雨天气,因屋面防水未及时做完,而导致回填土及灰土浸水而无法使用。竣工交付阶段监理工程师经检查发现有6根排架柱基础下沉,监理工程师立刻对该事故展开调查。根据调查结果分析原因认为,排架柱基础下沉主要是由施工过
其他单位因特殊原因需要使用本单位的原始凭证,正确的做法是()。
班主任处理偶发事件的原则有()
Althoughtherearebodylanguagesthatcancrossculturalboundaries,cultureisstillasignificantfactorinallbodylanguage
最新回复
(
0
)