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
Rainforests may store much less carbon than we thought. It could be time to dramatically revise our estimates following the disc
Rainforests may store much less carbon than we thought. It could be time to dramatically revise our estimates following the disc
admin
2013-08-12
28
问题
Rainforests may store much less carbon than we thought. It could be time to dramatically revise our estimates following the discovery that apparently similar forests hold vastly different amounts of the stuff. The finding is important because there are plans for governments worldwide to compensate tropical countries for protecting their forests as "carbon sinks" to curb global warming. If carbon cannot be counted, then dollars cannot be disbursed(支付).
Greg Asner of the Carnegie Institution for Science in Stanford, California, and colleagues say they used satellite mapping, laser probing of forest undergrowth from aircraft and local ground surveys across a large area of Peruvian rainforest to crack the problem of estimating how much carbon is locked up in forests. But the new technique has revealed a large, previously unknown variability in the density of carbon stored in apparently similar forests.
The Intergovernmental Panel on Climate Change says that there should be about 587 million tonnes of carbon stored in the study area, 43,000 square kilometres of lowland forest in the Madre de Dios region of Peru. But after dividing the area into 40 million individual grid(格子)squares and estimating for each the carbon stored as well as the rate at which it is being fixed and released, Asner says the real figure is just 395 million tones, a third less. "What really surprised us was how carbon storage differed among forest types and the underlying geology," says Asner. For instance, where the underlying rocks are younger, the soils and forests contain more carbon. "There has been no way to uncover these incredible patterns till now."
The study also reveals major carbon loss due to logging, farming, mining and road construction—even in areas still covered by forest. This "forest degradation" made up almost 50 per cent of all carbon lost from the forest. But the study also found substantial carbon accumulated through natural forest regrowth on abandoned land.
Asner is now conducting similar studies elsewhere round the world, which he says can be used to police the United Nations’ proposed initiative on Reducing Emissions from Deforestation and Forest Degradation in Developing Countries. This scheme would compensate countries that protect their forests to store carbon. It’s important that countries with large rainforests do this, because around 15 per cent of global carbon dioxide emissions come from tropical deforestation.
Markku Kanninen, a forest scientist at the Center for International Forestry Research, a World Bank-backed body based in Bogor, Indonesia, agrees: "This research shows the importance of improving our data on forest carbon. The IPCC global default values are not precise enough for national inventories."
What do we know about the "natural forest regrowth"? .....
选项
A、It is taken as a form of "forest degradation".
B、It is a measure against "forest degradation".
C、It results in great carbon loss.
D、It helps lock up much carbon.
答案
D
解析
解答本题关键是理解该句中accumulate的意思。该段前两句提到造成碳流失的原因,末句中的But提示语义上的转折,因而accumulate应该与碳流失无关,相反应理解为lock up或者store的意思。因此,本题应选D.同时排除C。
转载请注明原文地址:https://kaotiyun.com/show/vC97777K
0
大学英语六级
相关试题推荐
Wemustturntosomerecenthumaninventions__________________(为了完全理解这意味着什么).
Researchcarriedoutinrecentopinionpollsshowsthat______.Thepassageconcludesthat______.
A、Ascientistandhisassistant.B、Aphysicianandanurse.C、Apsychologistandanewsreporter.D、Aprofessorandhisstudent.
Ithasbeennecessarytoreferrepeatedlytotheeffectsofthetwoworldwarsinpromotingallkindsofinnovation.Itshouldb
Theconceptofpersonalchoiceinrelationtohealthbehaviorsisanimportantone.Anestimated90percentofallillnessmayb
A、Thelatestcomputertechnology.B、Theorganizingofanexhibition.C、Thepurchasingofsomeequipment.D、Thedramaticchanges
A、Buildings.B、Roads.C、Films.D、Cities.CWhichofthefollowingmaynotbemadefromgarbageaccordingtothepassage?
A、Whatamotheralwaysdoes.B、Everythingintheman’sroom.C、Whatamotherdoesn’tdo.D、Wheretoputthings.A语义理解题。男士说:“即使我的
CrowsareprobablythemostfrequentlymetandeasilyidentifiablemembersofthenativefaunaoftheUnitedStates.Thegreatn
Accordingtothenewhotel’sassistantdirectorofcommunications,themoveissupposedtomakeguests______(感觉像主人旅行回家了).
随机试题
学校管理基本环节有()个,分别是:()、()、()、()。
Q235碳钢和12Cr1SNi9不锈钢焊接时,可在Q235钢的坡口表面,用含铬镍高的材料堆焊一层奥氏体过渡层,厚度通常为()mm
十二经脉之气结、聚、散、络于筋肉、关节的体系是
下列关于脓肿切开引流,叙述正确的是
关于招标人终止招标要求的说法,正确的是()。
银行结算账户按存款人的不同分为()。
下列选项中,不属于通货紧缩的标志是()。
根据存货经济订货量模型,经济订货量是能使订货总成本与储存总成本相等的订货批量。()
甲出版社误将乙校的订货当做丙校的订货发给了丙校,这一行为属于()。
Youwillhearamancallingaboutexpenditure.MessageTotalamountonentertainmentthisyear:(9)______Itemswher
最新回复
(
0
)