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
A recent study by German researchers presents the possibility of "carbon farming" as a less risky alternative to other carbon ca
A recent study by German researchers presents the possibility of "carbon farming" as a less risky alternative to other carbon ca
admin
2015-01-09
85
问题
A recent study by German researchers presents the possibility of "carbon farming" as a less risky alternative to other carbon capture and storage technologies. It suggests that a significant percentage of atmospheric CO
2
could potentially be removed by planting millions of acres of a hardy little shrub known as Jatropha curcas, or the Barbados nut, in dry, coastal areas. But other experts raised doubts about the study’s ambitious projections, questioning whether the Barbados nut would be able to grow well in sandy desert soils and absorb the quantity of carbon their models predict.
The researchers behind the study say Barbados nut plantations could help to mitigate the local effects of global warming in desert areas, causing a decrease in average temperature and an increase in precipitation. If a large enough portion of the Earth were blanketed with carbon farms, they say, these local effects could become global, capturing between 17 and 25 metric tons of CO
2
per hectare each year over a 20-year period. The study, published in the journal Earth System Dynamics, states that if 730 million hectares of land—an area about three-quarters the size of the United States—were devoted to this method of carbon farming, the current trend of rising atmospheric CO
2
levels could be halted.
Carbon farms would not compete with food production if they were concentrated in dry coastal areas, the researchers said. In their scenario, oceanside desalination plants, partially powered by biomass harvested from the plantations themselves, provide a low-emissions irrigation method. The study states that the Barbados nut is uniquely suited to growing in regions inhospitable to other crops. The plant, which produces a nonedible seed that can be used to create biodiesel, is comfortable growing at temperatures exceeding 100 degrees Fahrenheit. It can also withstand high levels of contamination in the soil, making wastewater another potential source for irrigation.
The cost of carbon farming is comparable to the costs associated with other carbon capture and storage technologies, the study asserts. The researchers calculated that the total cost for a plantation would be between 42 and 63 per ton of carbon, or between about $ 55 and $ 85. The estimated cost of carbon capture technology varies widely, but the nonprofit Center for Climate and Energy Solutions pegs it between $36 and $81, depending on the emissions source. Wulfmeyer stressed that carbon farming could have "fantastic value for the local people" if international carbon markets pick up, promoting rural development and opening up the possibility of additional agriculture as the soil quality improves around the plantation.
In an email, van Noordwijk, chief science adviser for the World Agroforestry Center in Bogor, Indonesia, questioned the growth rate and the atmospheric carbon capture rate hypothesized by the study’s authors, calling the estimated carbon price of the plantations a "substantial underestimate." "We’re not talking about trees that create substantive, high-density woody biomass, but about a plant with a shrubby growth habit and a long track record of deceiving farmers with yield potentials that are not being realized," he said. Also, van Noordwijk said, "even with the abundance of water, the nutrient storage in sandy desert soil is low, and bringing in the nutrient supply to support high growth rates has high energy costs if nitrogenous fertilizer is used." He added, "The estimated carbon price of this option already indicates that there are far better opportunities for reducing ongoing emissions from peatland use and deforestation."
Which of the following characteristics does NOT belong to the Barbados nut?
选项
A、High temperature resistant.
B、The edible seed.
C、Adaptability to dirty water.
D、Biological sources of energy.
答案
B
解析
细节题。由题干定位至第三段。南该段第四、五句“The plant,which produces a nonedible seed thatcan be used to create biodiesel,is comfortable growing at temperatures exceeding 100 degrees Fahrenheit.It can also withstand high levels of contamination in the soil,making wastewater another potential sourcefor irrigation.”可知,在该段提到的桐油树的不同特点中,只有选项[B]“可以食用的种子”与文中不符,故选[B]。
转载请注明原文地址:https://www.kaotiyun.com/show/LydO777K
0
专业英语八级
相关试题推荐
Askedwhatjobtheywouldtakeiftheycouldhaveany,peopleunleashtheirimaginationsanddreamofexoticplaces,powerfulpo
AccordingtoEllen,theincreasingdemandforhiringisdueto
Inrecentyears,effortshavebeenmadetopromoteChineseoperastotheoverseascountries.OneofthemistowriteanEnglish
Inrecentyears,ahandfulofuniversitystudentschoosetocommitsuicideinfaceofloveissue,academicissueorjobissue.W
Accordingtoarecentreport,manyyoungemployeesandcollegegraduates,whomanagedtofleethebigcitiesincludingBeijing,
Researcherssaylightexercisemayhelpto
LandenclosureinIrelandandtheScottishhighlandsledtomassemigration,particularlyto______.
UltimoVargashadbeeninHatch,NewMexico,onlysixmonths,sinceMarch,andalreadyheownedhisownbusinesstocompetewith
EvenbeforethehumanorganismdevelopedintotheirpresentstageofHomosapiens,thebeginningsofculturewerealreadyeviden
TheScarletLetterbyHawthorneismainlyconcernedwith______.
随机试题
Thechildrenareas______aslarks.
A.引起特定感觉并激发大脑皮层发放传出冲动B.协调各种感觉在大脑皮层与皮层下结构之间的联系C.维持和改变大脑皮层的兴奋状态和维持觉醒状态D.维持睡眠状态E.参与学习和记忆网状结构上行激动系统的主要功能是
男,12岁,前牙切缘变薄,釉质表面高低不平,出现小的凹陷。镜下可见釉质变薄,表面高低不平,柱间质增宽,釉柱横纹及生长线明显,釉丛釉梭数目增多。病理诊断为
宋朝王安石的《伤仲永》中说有一个叫方仲永的少年,5岁时就能作诗,但后来由于他父亲没有及时教育,他到十二三岁时写的诗就不如以前了,到20岁左右,则“泯然众人矣”。“一两的遗传胜过一吨的教育”是谁提出的?()。
政府对因生、老、病、死、灾害事故、心身障碍等而发生困难的革命烈士家属、现役军人家属、革命残疾军人、复员退伍军人提供经济、医疗及其他方面的优待、抚恤属于()。
下面句子中,用语比较恰当的一项是()。
管理应具备的职能有哪些?
简述政体与国体的关系。
Inthe1950s,thepioneersofartificialintelligence(AI)predictedthat,bytheendofthiscentury,computerswouldbeconversi
JohnJuliusNorwichistheauthorofmorethanadozenbooksonNormanSicily,theSahara,MountAthosandtheVenetianandByza
最新回复
(
0
)