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
28
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
Yettheseglobaltrendshidestarklydifferentnationalandregionalstories.VittorioColao,thebossofVodafone,whichoperat
Sheansweredwithan______"No"totherequestthatsheattendthepublichearing.
Thedevelopmentofwritingwasoneofthegreathumaninventions.Itisdifficult【36】manypeopletoimaginelanguagewithoutwr
Overthepastcentury,allkindsofunfairnessanddiscriminationhavebeencondemnedormadeillegal.Butoneinsidiousformco
Thereareanumberofformatsforreportingresearch,suchasarticlestoappearinjournals,reportsaddressedtofundingagenc
Probablyoneofthemostrevolutionaryinnovationsinscienceduringthiscenturywastherecognitionofthedualityofmatter;【
Auctionsarepublicsalesofgoods,conductedbyanofficiallyapprovedauctioneer.Heasksthecrowdassembledintheauctionr
ForgetwhatVirginiaWoolfsaidaboutwhatawriterneeds--aroomofone’sown.Thewritershehasinmindwasn’tatworkonan
OnesillyquestionIsimplycannottolerateis"Howdoyoufeel?"Usuallythequestionisaskedofamaninaction-amanwalki
Theideaofpublicworksprojectsasadevicetopreventorcontroldepressionwasdesignedasameansofcreatingjobopportuni
随机试题
16岁男性患者,双下肢浮肿伴腹水,体重60kg,尿蛋白(++++),血清白蛋白15g/L,用泼尼松60mg/d治疗7天,病情未见好转,尿蛋白仍(++++)。此时应采取下列哪项措施
下列情况属于医院感染的是
患者男性,46岁,乙肝病史15年,超声检查示肝右叶8cm×9cm椭圆形肿块,边界较清,周边有晕,但不完整,内部回声不均,呈“块中块”表现,最可能的诊断是
中枢型SAS轻度SAS
肾岩翻花的发生与哪项因素最密切
下列药物入汤剂宜包煎的是()
交通安全的可靠性不仅与平面线形、纵坡有关,而且与()是否协调有密切的关系。
计算保守速动比率时,公式分子中不应包括()。
设向量组a1,a2线性无关,向量组a1+b,a2+b线性相关,证明:向量b能由向量组a1,a2线性表示。
(2009上集管)______是国家信息化体系的六大要素。
最新回复
(
0
)