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
44
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 does Greg Asner think about the problem of determining how much carbon is stored in forests?
选项
A、It has already been settled.
B、It has caused much dispute.
C、It is not as difficult as expected.
D、It is unlikely to be solved soon.
答案
A
解析
该句中的they used...to crack the problem表明Greg Asner与其同事已解决了如何估算森林存储碳量的难题。因此,本题应选A。
转载请注明原文地址:https://kaotiyun.com/show/qC97777K
0
大学英语六级
相关试题推荐
Ithasbeennecessarytoreferrepeatedlytotheeffectsofthetwoworldwarsinpromotingallkindsofinnovation.Itshouldb
Ithasbeennecessarytoreferrepeatedlytotheeffectsofthetwoworldwarsinpromotingallkindsofinnovation.Itshouldb
Theconceptofpersonalchoiceinrelationtohealthbehaviorsisanimportantone.Anestimated90percentofallillnessmayb
Theconceptofpersonalchoiceinrelationtohealthbehaviorsisanimportantone.Anestimated90percentofallillnessmayb
A、Theyareshopping.B、Theyarejogging.C、Theyareseeingamovie.D、Theyaredrinkingcoffee.D综合推断题。男士一直在批判现在的咖啡屋,在最后女士问男士是否喝
A、Theirself-reportedhealthrecordsandmassindex.B、Theirmaritalandworkhistory.C、Whethertheyhavechildrenornot.D、Al
ComparedwithEnglandandWales,Scotlandhasanothersetoflawsappliedtodivorceissues.A"DIY"divorcemaytakeeffectin
A、Trainers.B、Clowns.C、Acrobats.D、Magicians.AWhichofthefollowingperformerscannotbefoundinCirqueduSoleil?信息明示题。
ThewholeworldputattentiontotheSouthAsiawherethetsunamihappened.Before,musiciansproduceda"sonictsunami”,WallS
JonathanGlater,avisitingassistantprofessoroflawattheUniversityofCalifornia,Irvine,andaformerreporterattheNew
随机试题
以下属于商品入库阶段工作内容的是()
Eggs,thoughgoodtohealth,have______offatcontent.
在相同条件下,如果固定桥桥体的厚度减半,则其挠曲变形量变为
承包方必须在建设工程勘察、设计资质证书规定的()内承担建设工程的勘察、设计业务。
下列关于工程项目管理组织形式的特点说法正确的是( )。
记账凭证账务处理程序的特点是直接根据记账凭证逐笔登记总分类账。()
在英国的家庭中,绝对看不到对孩子没有理由的娇宠,犯错误的孩子会受到纠正甚至惩罚。家长们往往在尊重孩子独立人格的前提下,对孩子进行严格的管束,为的是让孩子明白,他们的行为不是没有边际的,不可以为所欲为。英国的法律明确规定允许家长体罚孩子。对这段文字理解不准确
直观行动思维的典型方式是()
国民生产净值与国民收入的差别是()
A、 B、 C、 D、 C在某个接口的配置模式下,指定当该接口断开或连接时向管理站发出通知的命令格式为:snmptraplink—status,所以选C。
最新回复
(
0
)