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
113
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/ZjU7777K
0
大学英语六级
相关试题推荐
Believeitornot,bluejeanshavebeenaroundforover130years.LeviStrausscreatedthefirstbluejeansas【B1】______forgo
Chinahasoutlinedanewapproachtoforeigninvestment,withplannerssayingtheywillnowfocuslessonattractinglargeamoun
A、Sheshouldbecarefulabouthowtospendhermoney.B、Sheshouldnotbuythebrownsuit.C、Sheshouldthinkcarefullywhenshe
Asfoodistothebody,soislearningtothemind.Ourbodiesgrowandmusclesdevelopwiththeintakeof【B1】______nutritious
TheAmericantraditionalpatternofclassroomexperienceatthecollegelevelbringstheprofessorandagroupof20-30students
A、Itwasprettygood.B、Itwasratherdull.C、Itwasnotwellorganized.D、Itwasattendedbymanypeople.C细节题。预读选项可知,话题是讨论一次活动
Everybody’sultimategoalinlifeistobesuccessfulandhappy.Eachperson’s【B1】______ofsuccessisdifferent.Manypeoplef
IfthepopulationoftheEarthgoesonincreasingatitspresentrate,therewilleventuallynotbeenoughresourcesleftto【B1】
Thedestructionofournaturalresourcesandcontaminationofourfoodsupplycontinuetooccur,largelybecauseoftheextreme
A、Thestategovernment.B、Thefederalgovernment.C、Thelocalgovernment.D、TheNationalAcademyofScience.B录音中指出,第二次世界大战后,由时任
随机试题
胃气虚的表现是
孙谦,字长逊,东莞莒人也。年十七为左军行参军,以治干称。父忧去职,客居历阳,躬耕以养弟妹,乡里称其敦睦。出为句容令,清慎强记,县人号为神明。泰始初,事建安王休仁,休仁以为司徒参军,言之明帝,擢为明威将军、巴东、建平二郡太守。郡居三峡,恒以威力镇之。谦将述职
激素
患者,男,56岁。食欲缺乏、乏力、消瘦2个月,近来多次排黑粪,右上腹部出现包块,并出现腹胀等症状。患者有肝炎、肝硬化病史及酗酒史。CT检查见肝右叶低密度肿块,边界不清楚,门静脉右支增粗、不强化,诊断最可能是
患者,女,55岁。反复眼睑、下肢水肿20年,恶心、呕吐1个月,胸闷2天入院。20年前患“肾小球肾炎”后经常出现眼睑、下肢水肿,未进行正规治疗;近5年来夜尿增多,血压140~160/90~110mmHg,血红蛋白60~90g/L,尿蛋白(+~++),尿隐血(
A、 B、 C、 D、 D
下列不属于基金销售机构的职责规范的是()。
《荷拉斯兄弟的宣誓》《苏格拉底之死》等绘画作品的作者,是法国19世纪()画家大卫。
在考察旁观者人数对危机情境救助行为影响的研究中,自变量是()
IhaveavividrecollectionofasummereveningwhenIhadtocarryoutarumenotomyonacow.AsaruleIwasinclinedtoplay
最新回复
(
0
)