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
2023-08-25
47
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] According to the fifth paragraph, it’s important that countries with large rainforests should __.
选项
A、be provided with valid data on forest carbon
B、reduce carbon emission from stopping deforestation
C、carry out the compensation scheme
D、conduct studies on carbon emission
答案
B
解析
要回答本题,必须找到第5段最后一句中this的所指。结合上一句内容可知,this指的应该是protect their forests to store carbon。在该段最后一句又提到,毁林导致二氧化碳排放增加。由此判断,停止毁林能够减少二氧化碳增加。本题应选B。
转载请注明原文地址:http://tihaiku.com/zcyy/2955450.html
相关试题推荐
Rainforestsmaystoremuchlesscarbonthanwethought.Itcouldbetimeto
Rainforestsmaystoremuchlesscarbonthanwethought.Itcouldbetimeto
Children’sideasabouttherainforestsandtheimplicationforcoursed
Children’sideasabouttherainforestsandtheimplicationforcoursed
Children’sideasabouttherainforestsandtheimplicationforcoursed
Children’sideasabouttherainforestsandtheimplicationforcoursed
Children’sideasabouttherainforestsandtheimplicationforcoursed
Children’sideasabouttherainforestsandtheimplicationforcoursed
Inthepushtocuttheamountofcarbonwereleaseintotheatmosphere,solu
Inthepushtocuttheamountofcarbonwereleaseintotheatmosphere,solu
随机试题
Weenjoyfinefoodfromthefirsttastetothelast.Similarly,goodwriting
Whenaninventionismade,theinventorhasthreepossiblecoursesofaction
Theselow-budgetanimatedfilmsarethemainsourceof______ofthisindependent
GeorgeHerbertMeadsaidthathumansaretalkedintohumanity.Hemeantthat
[audioFiles]audio_eufm_j07_001(20082)[/audioFiles]A、Itmaynotbewarmenough.
治疗急性心肌梗死阳气虚衰,寒凝心络证,应首选A.四逆汤合桃红四物汤 B.生脉
产后会阴护理,下列错误的是A:每日消毒液擦洗会阴部两次 B:会阴水肿可用95%
据2006年4月6日《新闻晚报》报道,3月份人民币汇率双向波动加剧,上周人民币汇
下面哪些条件难以形成逆温()。 A多云的夜晚 B晴朗少云的夏季夜晚
准时交货是顾客最关心的问题之一,为了监制准时交货率,宜采用()。[2008年真
最新回复
(
0
)