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
2023-08-15
36
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:https://tihaiku.com/zcyy/2929484.html
相关试题推荐
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglas
低碳生活(low-carbonlife)倡导人们在生活中减少二氧化碳的排放,是一种低能量、低消耗和低开支的生活方式。它要求人们以更健康、更安全和更自然
Rainforestsmaystoremuchlesscarbonthanwethought.Itcouldbetimeto
Rainforestsmaystoremuchlesscarbonthanwethought.Itcouldbetimeto
低碳生活(lowcarbonlife)对于我们普通人来说是一种态度。我们应该积极提倡并去实践低碳生活,从自己做起,从节约水电这些点滴做起。除了植树,
Inthepushtocuttheamountofcarbonwereleaseintotheatmosphere,solu
Rainforestsmaystoremuchlesscarbonthanwethought.Itcouldbetimeto
随机试题
1 Divorceisoneofthosecreations,likefastfoodandliterock.thathavemo
Nowadaysmoreandmoreforeignenterprisesandcompaniesarenolongerrelyi
男性,45岁,粘连性肠梗阻术后持续胃肠性减压8天,仍未排气。查体:腹胀,肠鸣音消
大量口服Leu可影响到小肠上皮细胞对哪一种氨基酸的吸收?( )A.AsD B
慢性支气管炎急性发作期最主要的治疗是A.加强营养支持疗法 B.控制感染 C.
胰腺的解剖位置,下列描述不正确的是A.胰头上方为门静脉及肝动脉 B.钩突后方为
脊髓灰质炎好发人群是:A.老年人 B.孕妇 C.儿童 D.青少年
属于酶类试验的是A.杆菌肽试验B.甲基红试验C.硝酸盐还原试验D.明胶液化试验E
某一单室模型药物的消除速度常数为0.3465/h,分布容积为5L,静脉注射给药2
(2021年真题)甲公司应收乙公司1000万元,已计提坏账准备50万元。2×20
最新回复
(
0
)