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
The climate of Earth is changing. Climatologists are confident that over the past century, the global average surface temperatur
The climate of Earth is changing. Climatologists are confident that over the past century, the global average surface temperatur
admin
2013-01-19
66
问题
The climate of Earth is changing. Climatologists are confident that over the past century, the global average surface temperature has increased by about half a degree Celsius. This warming is thought to be at least partly the result of human activities, such as the burning of fossil fuels and the clearing of forests for agriculture. As the global population grows and national economies expand, the global average temperature is expected to continue increasing by an additional 1.0 to 3.5℃ by the year 2100.
Climate change is one of the most important environmental issues facing humankind. Understanding the potential impacts of climate change for natural ecosystems is essential if we are going to manage our environment to minimize the negative consequences of climate change and maximize the opportunities that it may offer. Because natural ecosystems are complex, nonlinear systems, it follows that their responses to climate change are likely to be complex. Climate change may affect natural ecosystems in a variety of ways. In the short term, climate change can alter the mix of plant species in land ecosystems such as grasslands. In the long term, climate change has the potential to dramatically alter the geographic distribution of major vegetation types--savannas, forests, and tundra. Climate change can also potentially alter global ecosystem processes, including the cycling of carbon, nitrogen, phosphorus, and sulfur. Moreover, changes in these ecosystem processes can affect and be affected by changes in the plant species of the ecosystem and vegetation type. All of the climate change-induced alterations of natural ecosystems affect the services that these ecosystems provide to humans.
The global average surface temperature increase of half a degree Celsius observed over the past century has been in part due to differential changes in daily maximum and minimum temperatures, resulting in a narrowing of the diurnal temperature range. Decreases in the diurnal temperature range were first identified in the United States, where large-area trends showed that maximum temperatures have remained constant or increased only slightly, whereas minimum temperature have increased at a faster rate. In this issue, Alward et al. report on the different sensitivities of rangeland plants to minimum temperatures increases.
Which of the following is NOT mentioned as a reason for the global warming?
选项
A、The burning of fuels such as coal or oil.
B、The clearing of forests.
C、The cultivation of farmland.
D、The negative consequences of human activities.
答案
C
解析
只有C在文中没有提到。
转载请注明原文地址:https://kaotiyun.com/show/ZJ2O777K
0
考博英语
相关试题推荐
Itisfrequentlyassumedthatthemechanizationofworkhasarevolutionaryeffectonthelivesofthepeoplewhooperatethene
Shehadashy,retiringsidetoherpersonalitythatwascompletelyatoddswithherpublic______.
InarecentbookentitledThePsychicLifeofInsects,ProfessorBouviersaysthatwemustbecarefulnottocreditthelittlew
HisrecommendationthatAirForceinvestigatestheUFOsightingwasapprovedbythecommissionandreferredtotheappropriate.
Nottoomanyyearsagomymotherjoggedinthealleybehindourhousebecauseshewasembarrassedtoseejogginginpublic.
______atinthisway,thepresenteconomicsituationdoesn’tseemsogloomy.
Ingeneral,the______amountthatastudentspendsforhousingshouldbeheldtoone-fifthofthetotalforlivingexpenses.
Newandbizarrecrimeshavecomeintobeingwiththeadventofcomputertechnology.Organizedcrimehasbeendirectlyinvolved;
Atallageandatallstagesoflife,fearpresentsaproblemtoalmosteveryone."Wearelargelytheplaythingsofourfears,"
Theaccuracyofscientificobservationsandcalculationsisalways______thescientist’stime-keepingmethods.
随机试题
A.烊化B.冲服C.二者均是D.二者均不是雷丸服用应()
系统论的基本思想()
腰椎穿刺术可用于()。
风湿性心脏病二尖瓣狭窄病人的早期表现,应除外
概算指标在具体内容和表示方法上有()两种形式。
贾某取得单张发票中奖所得500元,属于偶然所得,应按照规定缴纳个人所得税100元。()
富友公司实行全面预算管理,每年年底都在深入分析每个部门的需求和成本的基础上,根据未来的需求编制预算。富友公司编制预算采用的方法的优点有()。(2017年)
债券的收回与偿还涉及的问题有()。
安慰剂效应
行列式
最新回复
(
0
)