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
2017-06-29
33
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."
Markku Kanninen is most likely to agree that carbon stored in forests _____.
选项
A、has been decreased lately
B、has been increased lately
C、has been underestimated
D、has been overestimated
答案
D
解析
最后一段第1句表明Markku Kanninen认为碳汇数据有改善的必要,not precise说明碳汇数据一直以来不够准确,但到底数据是“过高”,还是“过低”呢?结合第1段首句就知道了,该句中的less…than we thought表明我们一直都高估了森林存储碳的能力。因此本题应选D,并排除C。
转载请注明原文地址:https://kaotiyun.com/show/ijU7777K
0
大学英语六级
相关试题推荐
A、Someonewhoalwaystalksabouthimself.B、Themostviolenttypeofco-workers.C、Someonewhostabsyourback.D、Themostcommo
Asfoodistothebody,soislearningtothemind.Ourbodiesgrowandmusclesdevelopwiththeintakeof【B1】______nutritious
A、Bycoach.B、Bybus.C、Bycar.D、Bytrain.C推断题。短文提到自行驾车前往是最好的选择,而且该购物中心提供12000个免费停车位,可推断C是最佳答案。由选项可知,此题考查使用某个交通工具。因此听音重点应放在它们之
Itiscommonlyheldthatdrinkingmoderateamountsofalcoholcanreducetheoddsofhavingadeadlyheartattack.More【B1】_____
WhatisAprilFoolsDayandwhatareitsorigins?Itis【B1】______believedthatinmedievalFrance,NewYearwascelebratedon1
A、MIT.B、ReedCollege.C、Harvard.D、Yale.A选项都是学校名,应该一一记录听到的相关信息:A旁边记下first(或者数字1),D2,C4,然后仔细听问题。排名第一和最后的往往被考查。
A、ProfessorGeorge’sclassisveryinteresting.B、ProfessorJordan’sclassismoreinteresting.C、Hehasn’tattendedProfessorJ
It’smyhonortobeheretonight.OurorganizationiscalledtheNoiseAbatementSocietythatmonitorsandtriestodealwit
汉字蕴含古代中国人的智慧,体现中国悠久的历史。书写汉字有助更好地理解传统文化,因为每一个汉字都有其独特的文化内涵。但近年来,随着电脑和手机的普及,越来越多的人习惯于电子输入。人们普遍认为,很多人手写汉字的能力有了明显的下降。人们已开始意识到用纸和笔来手写文
A、50years.B、3years.C、13years.D、5years.D录音提到其曾带领国家地理探险队开展长达5年的可持续海洋探险,故D项是正确答案。
随机试题
A.皮肤浅薄部位B.皮肤松弛部位C.短针进针D.长针进针E.四肢穴位
列入国家药品标准的药品名称为药品的
痰多色白易咯,胸膈痞闷,恶心呕吐,肢体倦怠,或头眩心悸,舌苔白润,脉滑。方剂选用
有关酶原激活的概念,正确的是
关于目前医院内获得性肺炎的病原学特点,不恰当的是
A.瑞芬太尼B.哌醋甲酯C.麻黄素D.新康泰克列入现行第一类精神药品品种目录的是
库存管理就是库存物资的管理,包括数量管理和质量管理,其主要目的是在保持物资数量或质量的前提下,保证其储存质量,维持其实用价值。()
一个人真正的“精神饥饿感”应该从中小学时期开始培养。现阶段我国必须在学校教育阶段“拯救阅读”,尤其是儿童阅读。“阅读是消灭无知、消灭贫穷、消灭绝望的武器”。一个民族精神境界的高下取决于阅读的水平;一个人的阅读史,就是他的精神发育史:一个没有阅读的学校永远不
设矩阵求可逆矩阵P,使(AP)T(AP)为对角矩阵.
October3rd,2009DearSir,InyoureditorialonAugust31st,thereseemstobesomeconfusedthinkinginattemptingtoestabli
最新回复
(
0
)