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
2018-04-15
19
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 is the result of the discovery that similar forests may hold different amounts of carbon?
选项
A、Forests can’t be used as "carbon sinks".
B、Carbon can’t be stored in rainforest.
C、Compensation can’t be distributed.
D、Global warming can’t be curbed.
答案
C
解析
题干是第1段第2句提到的内容,根据该段第3、4句表明的因果关系可推断,第2句提到的“相似的森林吸收的碳量存在很大差异”造成的结果就是第4句提到的“补偿金也就无法支付”。因此,本题应选C。
转载请注明原文地址:https://jikaoti.com/ti/GixFFFFM
0
大学英语六级
相关试题推荐
A、Beinghealthyandcharming.B、Tobewealthyandattractive.C、Beingfamousandattractive.D、Tobehealthyandaccepted.A录音开头
LifeBeginsat100[A]Thisyear,thenumberofpensionersintheUKexceededthenumberofminorsforthefirsttimeinhistory.
BoththeSenateandHousehealthcarebillsproposeincentivestoboostcorporatewellnessprogramsthataimtohelpemployeess
A、Physicalexamination.B、Laboratorytests.C、Medicalhistory.D、Complextechnology.C录音接着讲到医生为何要学会倾听,原因就是“医生能够做出正确诊断,其中75%有价值的信
Forthispart,youareallowed30minutestowriteashortessayentitledHowtoEstablishaHealthyLivingStyle?Youshouldwr
A、Tosolveeconomicproblem.B、Toincreasegenderequality.C、Tofollowtheinternationaltrend.D、Toincreasethenumberofpop
A、Itcan’tbecompressed.B、Itisoftenpolluted.C、Itstemperatureoftenfluctuatesdramatically.D、Itlimitstheirsize.A由“Ye
SmallholderfarmersresettledtorainforestsbytheBraziliangovernmenthaveplayedanunrecognisedroleindeforestationthere
SmallholderfarmersresettledtorainforestsbytheBraziliangovernmenthaveplayedanunrecognisedroleindeforestationthere
随机试题
翼外肌是由以下哪条神经支配的
维生素K可用于哪些疾病
在填筑排水反滤层前,应对坝基覆盖层进行试验分析。对于黏性土,做天然干密度、含水量及塑性指数试验;当塑性指数小于()时,尚需进行颗粒分析。
发行人应披露会计师事务所的审计意见类型。财务报表被出具带强调事项段的无保留审计意见的,应全文披露审计报告正文以及董事会、监事会及注册会计师对强调事项的详细说明。( )
2011年11月,田某为达到虚开增值税专用发票牟利的目的,伙同涂某,以涂某名义注册了永盛公司。永盛公司经营范围为中药材收购、销售、加工。12月,永盛公司取得一般纳税人资格,2011年12月至2012年6月田某以永盛公司销售中药材的名义,在仅有少量货物交易量
()含有众多酶系,是细胞中含酶最多的由两层膜包被的细胞器。
观看视频,根据要求回答问题。题目:《尊重幼儿》视频描述:一位幼儿教师在教授《动物的对话》时,让幼儿分角色表演。有一位幼儿问:“老师,我能不用书中的原话吗?’’老师和蔼地问:“为什么呢?”幼儿说:“书中的原话太长,我背不下来,但拿书表演,
古代警察的特点包括()
Whichoneofthefollowingfourisleastliketheotherthree?
StephenWilliamHawkingputforwarda______thataself-containeduniversemayhavenoedgeorboundary.
最新回复
(
0
)