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
2014-05-30
56
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."
According to the fifth paragraph, it’s important that countries with large rainforests should __.
选项
A、be provided with valid data on forest carbon
B、reduce carbon emission from stopping deforestation
C、carry out the compensation scheme
D、conduct studies on carbon emission
答案
B
解析
要回答本题,必须找到第5段最后一句中this的所指。结合上一句内容可知,this指的应该是protect their forests to store carbon。在该段最后一句又提到,毁林导致二氧化碳排放增加。由此判断,停止毁林能够减少二氧化碳增加。本题应选B。
转载请注明原文地址:https://kaotiyun.com/show/zv17777K
0
大学英语六级
相关试题推荐
A、Thefast-developingtechnology.B、Thepeoplewhodesigndifferentapplications.C、ThewayhowpeoplemakeuseoftheInternet.
PlanB:SkipCollegeWhat’sthekeytosuccessintheUnitedStates?OtherthanbecomingarealityTVstar,theansweri
Don’tworry,behappyand,accordingtoanewresearch,youwillalsobehealthy.Itisestimatedthatoverthecourseofon
A、Healthinsurance,paidvacation,andacompanyvehicle.B、Paidvacation,opportunitiesforadvancement,andmedicare.C、Opport
SecurityorPrivacy?1.近年来很多公共场合都安装了监控摄像头以保护人们的安全2.摄像头也对人们的隐私造成了一定的影响3.我的观点
A、Hemadeuphismindtoworkforthedisable.B、Hedecidedtoworkinanautocompany.C、Heunfortunatelyhadacaraccident.D
Rainforestsmaystoremuchlesscarbonthanwethought.Itcouldbetimetodramaticallyreviseourestimatesfollowingthedisc
AfterSusanJoycewaslaidofffromDigitalEquipmentCorp.,shewashorrifiedtohearoftwosuicidesinherlayoffgroup.Such
A、Thewomanisabigfanoftraveling.B、Thewomanisdesperatetowritetohim.C、Hisauntwillkeepthemailsforhim.D、Hewi
A、Byshowingamemorandum’sstructure.B、Byanalyzingtheorganizationofaletter.C、Bycomparingmemorandumswithletters.D、B
随机试题
《国际货币基金协定》的主要内容包括()
假设按某种工艺生产的金属纤维的长度X(单位:mm)服从正态分布N(5.2,0.16),现在随机抽取15根纤维,测得它们的平均长度=5.3,如果总体方差没有变化,可否认为现在生产的纤维平均长度仍为5.2mm?(α=0.05)(附:u0.025=1.96)
护理学的4个基本概念是
女性淋病主要的感染部位是
A.组织接种单位销毁B.立即停止销售C.对该疫苗依法查封、扣押D.采取应急处置措施依照《疫苗流通和预防接种管理条例》的规定接到质量可疑疫苗报告的卫生主管部门应()
该租赁合同的性质属于()。若本案中双方未约定租赁期限,甲乙双方又无法就租赁期限协议补充,下列关于合同解除的说法正确的是()。
知图4—31所示斜面的倾角为θ,若要保持物块A静止,则物块与斜面之间的摩擦因数f所应满足的条件为()。
常见的金融风险类型包括()。
已知函数.f(x)=12/x+3x(x>0),则f(x)的最小值为________.
Obesityisanepidemictosomeandanopportunitytoothers.Morethantwo-thirdsofAmericansareoverweight.Findawaytobat
最新回复
(
0
)