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
2016-08-29
26
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/uiG7777K
0
大学英语六级
相关试题推荐
Ahappymarriageapparentlyisgoodmedicine,buthostilespousesmay【B1】______oneanother’shealth.Couplesinconflict-ridden
A、Freefoodandlodging.B、LearningEnglish.C、StayingwithEnglishfamilies.D、Meetingyoungpeople.D这一制度使得那些女孩们可以与英国家庭住在一起,有免
A、Childrenunder11.B、Teenagers.C、Adults.D、Oldpeople.A心理健康专家们担心那些在11岁之前就经历过灾难的儿童。
A、HerecentlyspentamonthinChicago.B、Hecanrecommendmanythingstodo.C、Chicagoisanexpensiveplacetohavefun.D、He’
A、Listeningtoradioreportstoavoidtrafficjams.B、Usingpublictransportationtogettowork.C、Communicatingthroughcomput
A、Heboughtitatawell-knownstore.B、Itwasveryexpensive.C、Hedoesn’tconsideritattractive.D、Someonegaveittohim.D“
A、She’llbetravelingduringwinterbreak.B、She’llbewarkingduringvacation.C、She’slookingforwardtogoinghome.D、Shewan
Forthispart,youareallowed30minutestowriteanapplicationforscholarship.Youshouldwriteatleast150wordsfollowing
A、Howtheteamintegrateswithwhatitissupposedtoserve.B、Howtheteamisbuilttokeepimprovingitsperformance.C、Whatt
Memoryappearstobestoredinseveralpartsofthelimbic(边缘的)systemofthebrain,andanyconditionthatinterfereswiththef
随机试题
下述属于器官特异性自身免疫性疾病的是
分包工程竣工验收报告经承包人认可后()天内,分包人向承包人递交分包工程竣工结算报告及完整的结算资料。
一、背景某电力建设公司在某地承包一500kV的高压变电站及20km高压输电线路的施工,设备由施工单位采购。在高压外线施工中,因施工场地及占用道路与当地农民和交通管理部门发生矛盾,变压器安装因交货期滞后及质量问题与供货商和业主发生矛盾,分包队伍交工
企业发生的下列济业务中,能够引起资产总额增加的是()。
由于组织制度不合理、运行机制不健全等原因造成员工绩效低下的,要采取()。
________是由主要音和上方邻音快速均匀地交替弹奏而成。
设A为3阶矩阵,P=(α1,α2,α3)为3阶可逆矩阵,Q=(α1+α2,α2,α3).已知则QTAQ=().
—Whatisthebookabout?—Itconcerns______yourmoney.
A、Shedoesn’tlikepicnic.B、Itwillbetoohot.C、Shewillhaveanexamnextweek.D、Thebiologyclasswillgotothebeachnex
Thispassageismainlyaboutsomesocialandculturalchangesof1970sand1980s.TheRepublicanseemedtobemoreinterestedi
最新回复
(
0
)