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
52
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/0WNFFFFM
0
大学英语六级
相关试题推荐
Bloggingisapastimeformany,evenalivelihoodforafew.Forsome,itbecomesanobsession(着迷,使人痴迷的事物).Suchbloggersoften
Inmanystressfulsituationsthebody’sresponsescanimproveourperformance.Webecomemore【B1】______,morealert,betterabl
Ahappymarriageapparentlyisgoodmedicine,buthostilespousesmay【B1】______oneanother’shealthCouplesinconflict-ridden
TheAmericantraditionalpatternofclassroomexperienceatthecollegelevelbringstheprofessorandagroupof20-30students
A、Byprediction.B、Byrecording.C、Byobservation.D、Byexamination.C文中提到两种方法,答案C是听到的原词,属于第一种方法。选项中的by说明此题考查一种做事方法。原文中有“自问自答”的地
WhatisAprilFoolsDayandwhatareitsorigins?Itis【B1】______believedthatinmedievalFrance,NewYearwascelebratedon1
A、Hedoesn’twritewellenough.B、Heisnotaprofessionalwriter.C、Hehasn’tgotanyprofessionalexperience.D、Hedidn’tperf
A、Parents’supportandloanforthestudents.B、Thedecliningopportunitiesforthequalifiedpeople.C、Thegrowingneedforhig
A、Declarativememoryandprocedurememory.B、Declarativememoryandshort-termmemory.C、Short-termmemoryandprocedurememory.
A、TotourthemostfamoussightsofinterestinChina.B、ToinvestigatethecomputermarketinChina.C、Tonegotiateacontract
随机试题
A、mountainB、groupC、thousandD、withoutB画线部分读[u:],其他选项的画线部分读[аu]。
A、肛门周围脓肿B、坐骨肛管间隙脓肿C、骨盆直肠间隙脓肿D、肛瘘E、肛裂肛门周围局部从持续性胀痛而逐渐加剧为持续性跳痛,合并排尿困难、里急后重,排便时疼痛加重,伴有全身乏力、发热、食欲缺乏()
主管全国药品监督管理工作的部门是:
根据有关部门法律规范和依法制定的城市规划所申请的选址提出审核意见的是()。
下列选项关于燃气管道严密性试验表述正确的是()。
施工成本分析是在()的基础上,对成本的形成过程和影响因素进行分析。
在鱼,虾,蟹洄游通道上建闸,筑坝,对渔业资源有严重影响的,建设单位应当建造()或采取其他补救措施。
几个工人日报的记者,来我厂了解工会活动情况。
程序通过定义学生结构体变量,存储了学生的学号、姓名和3门课的成绩。函数fun的功能是对形参b所指结构体变量中的数据进行修改,最后在主函数中输出修改后的数据。例如:b所指变量t中的学号、姓名、和三门课的成绩依次是:10002、’’ZhangQi’’、9
InstructiononaseedpackageNASTURTIUMJEWELMIXEDCOLORSPLANTSDWARFWITHSMALLLEAVES.SEMIDOUBLEFLOWERSINWIDECOLOR
最新回复
(
0
)