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
85
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
Atthepresenttime,98percentoftheworldenergyconsumptioncomesfromstoredsources,suchasfossilfuelsornuclearfuel.
KevinRogersusedtobemyboss.Atthattimehewasahardworking,up-and-comingbusinessmanandarealslave-driver,alwayst
Thedevelopmentofwritingwasoneofthegreathumaninventions.Itisdifficult【36】manypeopletoimaginelanguagewithoutwr
Thedevelopmentofwritingwasoneofthegreathumaninventions.Itisdifficult【36】manypeopletoimaginelanguagewithoutwr
AtleastsincetheIndustrialRevolution,genderroleshavebeeninastateoftransition.Asaresult,culturalscriptsaboutm
Motorwaysare,nodoubtthesafestroadsinBritain.Mile【41】mile,vehicleforvehicle,youaxemuch【42】likelytobekilledors
Theirconfidenceinhimwasgreatly______byhisprolongedhesitationbeforetakinganyaction.
Despitetheirmanydifferencesoftemperamentandofliteraryperspective,Emerson,Thoreau,Hawthorne,Melville,andWhitmansh
WhenFrankDaletookoveraspublisherofLosAngelesHerrald-Examiner,theorganizationhadjustendedaten-yearstrike.There
WhenFrankDaletookoveraspublisherofLosAngelesHerrald-Examiner,theorganizationhadjustendedaten-yearstrike.There
随机试题
某公司的管理员在公司的Exchange2007邮件系统上设置了内容筛选功能。他希望通过如图的设置阻止SCL分级大于或等于7的邮件在经过如下图设置后,只有用户bob反映依然可以接受到邮件头的发件人地址,邮件正文的发件人地址不一致的类型的邮件。产生这种情况的
分析下列词语中哪些是单纯词:(1)支配——支吾(2)罗盘——罗汉(3)探戈——探险(4)普通——卡通
脱羧基后的产物可使血管舒张的氨基酸
我国医师在器官移植问题上的道德责任,错误的是
在建设工程项目中,()的划分应按专业性质、建筑部位确定。
根据《支付结算办法》规定,有金额起点限制的结算方式是()。
历史课中讲到“楚汉战争”中项羽自杀时,一个学生突然说道:“傻瓜。”下列处理方式中最恰当的一项是()。
根据下列图和文字资料回答以下问题:某省住宿餐饮业零售额增长迅速(如图所示),2003年住宿餐饮业零售额仅为259.45亿元,2006年突破400亿元,至2007年高达479.76亿元。2006年该省限额以上餐饮企业商品零售额为342952万元,比
用二维表结构表示实体与实体之间的联系的模型是()。
【S1】【S8】
最新回复
(
0
)