首页
登录
职称英语
Rainforests may store much less carbon than we thought. It could be time to
Rainforests may store much less carbon than we thought. It could be time to
游客
2024-04-12
4
管理
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." [br] 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://tihaiku.com/zcyy/3552144.html
相关试题推荐
Globalindustrializationhaspouredcarboninthesky,andnowwemustpayt
Globalindustrializationhaspouredcarboninthesky,andnowwemustpayt
Globalindustrializationhaspouredcarboninthesky,andnowwemustpayt
Globalindustrializationhaspouredcarboninthesky,andnowwemustpayt
Globalindustrializationhaspouredcarboninthesky,andnowwemustpayt
Globalindustrializationhaspouredcarboninthesky,andnowwemustpayt
[originaltext](23)Ifyoustopeatingmeat,yourfood-relatedcarbonfootpr
Rainforestsarecriticallyimportanttoourwell-being.Becausethey【B1】____
Rainforestsarecriticallyimportanttoourwell-being.Becausethey【B1】____
Rainforestsarecriticallyimportanttoourwell-being.Becausethey【B1】____
随机试题
[originaltext]M:DoyouthinkLaurawillaccepttheproposal?W:Noway.Q:Wh
收入水平的高低和获取收入时间长短与货币需求分别有什么关系?()。A.正相关,正
不在脑干内交换神经元的传导束是:()A.脊髓丘脑束 B.薄束 C.楔
被称为莱茵河畔“通天塔”的建筑是()。A.科隆大教堂 B.比萨大教堂 C.
双缩脲试剂成分除了酒石酸钾钠、氢氧化钠外,重要的还有A.草酸钾 B.磷钼酸钾
货币性薪酬包括()。A.工资 B.奖金 C.津贴 D.补贴 E.劳
2010-10.足阳明经“气不足”病机的表现是 A.消谷善饥B.身以前皆寒
抗力形A.要求在完成修复后修复体和患牙具有能抵抗外力而不致破坏或折裂的外形 B
采用全护简法钻进成孔说法正确的是()A.避免进尺过快造成塌孔、埋钻事故
下列各项中,属于会计总目标的是()。A、向投资者提供信息 B、向债权人提供信息
最新回复
(
0
)