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
2013-02-16
93
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°C 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 temperatures have increased at a faster rate. In this issue, Alward’s report on the different sensitivities of rangeland plants to minimum temperatures increases.
The second paragraph is primarily concerned with______.
选项
A、the potential impacts of climate change for natural ecosystems
B、how to minimize the negative consequences of climate change
C、how to maximize the opportunities that climate change may offer
D、the complex, nonlinear nature of natural ecosystems
答案
A
解析
本题的四个选项中,只有A项为正确答案。这可从文中第二段的内容推知,即对人类来说,气候变化是众多重要环境问题之一。后面又分析了气候变化会带来的诸多影响和后果,特别是对生态环境的影响。
转载请注明原文地址:https://kaotiyun.com/show/VFmO777K
0
考博英语
相关试题推荐
Probablyoneofthemostrevolutionaryinnovationsinscienceduringthiscenturywastherecognitionofthedualityofmatter;【
He______somuchworkthathecouldn’treallydoitefficiently.
Themostconvincingevidencefortheimportanceofadultinfluenceonachild’sintelligencecomesfromastudyof"atrisk"chi
ForgetwhatVirginiaWoolfsaidaboutwhatawriterneeds--aroomofone’sown.Thewritershehasinmindwasn’tatworkonan
ThecurrentemergencyinMexicoCitythathastaken,overourlivesisnothing.Icouldeverhaveimaginedformeormychildren
Newandbizarrecrimeshavecomeintobeingwiththeadventofcomputertechnology.Organizedcrimehasbeendirectlyinvolved;
Whatdoconsumersreallywant?That’saquestionmarketresearcherswouldlovetoanswer.Butsincepeopledon’talwayssaywhat
Sincethelineageofinvestigativejournalismismostdirectlytraceabletotheprogressiveeraoftheearly1900’s,itisnots
Timeforanotherglobal-competitivenessalert.IntheThirdInternationalMathematicsandScienceStudy—whichlastyeartesteda
InthedaysimmediatelyfollowinghurricaneAndrew’sdeadlyvisittoSouthFlorida,AllstateInsurancehastilydispatchedmoret
随机试题
下列关于有特定身份者与无特定身份者共同犯罪的说法正确的有()。
物理热价与生物热价不相等的营养物质是
环孢素治疗AA的疗程一般长于
打桩施工场地应按坡度不大于( ),地耐力不小于83kPa的要求进行平整压实,或按桩机的说明书要求进行。
执行工程建设强制性标准的监督检查方式有()。
中短波发射台机房设备接地不包括()。
下列关于税负转嫁的表述中,正确的是()。
某企业留存收益年初余额为100万元,本年利润总额为600万元,所得税费用为150万元,按净利润的10%提取法定盈余公积,按净利润的5%提取任意盈余公积,并将盈余公积10万元和资本公积10万元转增资本,发放现金股利10万,发放股票股利20万元。该企业留存收益
深化司法体制改革,坚持和完善中国特色社会主义司法制度,确保人民法院、检察院依法独立公正行使()。
使用turtle库绘制轮廓颜色为红色(red)、填充颜色为粉红色(pink)的心形图形,效果如下图所示。阅读程序框架.补充横线处代码。fromturtleimport*color(’red’,①)(②)left(135)fd(100)r
最新回复
(
0
)