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
76
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 do we know about the "natural forest regrowth"?
选项
A、It is taken as a form of "forest degradation".
B、It is a measure against "forest degradation".
C、It results in great carbon loss.
D、It helps lock up much carbon.
答案
D
解析
解答本题关键是理解该句中accumulate的意思。该段前两句提到造成碳流失的原因,末句中的But提示语义上的转折,因而accumulate应该与碳流失无关,相反应理解为lock up或者store的意思。因此,本题应选D,同时排除C。
转载请注明原文地址:https://kaotiyun.com/show/xDT7777K
0
大学英语六级
相关试题推荐
Thatalackofwealthalltoooftentranslatesintopoorhealthmayseempainfullyobvious.Butnowareviewofhealthinequalit
LifeBeginsat100[A]Thisyear,thenumberofpensionersintheUKexceededthenumberofminorsforthefirsttimeinhistory.
Rainforestsmaystoremuchlesscarbonthanwethought.Itcouldbetimetodramaticallyreviseourestimatesfollowingthedisc
A、Raisethebikeriders’awarenessofsafety.B、ReviseallthetransportationlawsinSeoul.C、Providefreeinsuranceforthebi
A、Namesoftherecommendedbooks.B、Thenameandnumberofherprofessor.C、Aletterofrecommendationfromthesupervisor.D、Th
近年来中国经济增长很快,而污染和排放(emissions)问题也同样惊人。中国已是全球最大的二氧化碳(carbondioxide)排放国,尽管其经济规模仅为美国的一半左右。最大污染源是煤炭。中国煤炭消耗量约占全球的五分之二,并以每年约10%的速度增长。好
A、Itcan’tbecompressed.B、Itisoftenpolluted.C、Itstemperatureoftenfluctuatesdramatically.D、Itlimitstheirsize.A由“Ye
SmallholderfarmersresettledtorainforestsbytheBraziliangovernmenthaveplayedanunrecognisedroleindeforestationthere
SmallholderfarmersresettledtorainforestsbytheBraziliangovernmenthaveplayedanunrecognisedroleindeforestationthere
随机试题
()抽油机下行(下冲程)时,固定阀是关闭的,游动阀是开的,悬点(光杆)所受静载荷为:抽油杆(柱)在液体中重。
下列以碳酸氢钠与枸橼酸为崩解剂的是
男孩,7岁,查体合作,跛行步态明显,左髋屈曲、外展、外旋位畸形,左下肢肌肉萎缩。诊断时首先应进行
(2004)中小学南向的普通教室冬至日底层满窗日照时间不应小于()。
根据《水利水电工程标准施工招标文件》,除专用合同条款另有约定外,现场测量基本控制点、基线和水准点应由()提供。
会计核算软件按照不同的适用范围可分为通用会计核算软件和商品化会计核算软件。()
读下列A、B两工业区示意图,回答问题。A、B两图中___________是我国的辽中南工业基地,该地区___________、___________等矿产资源丰富。你能列举几种该工业基地的主要工业部门吗?(至少说出三种)___________;___
下列句子中有语病的一句是()。
为保护中农利益,《兴国土地法》对《井冈山土地法》进行的一个原则性改动是()。
Accordingtothepassage,Chinaisaleadingbuyerof_________.
最新回复
(
0
)