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
Fertilizer use has exploded, overloading plants worldwide, likely altering ecosystems for decades to centuries, scientists repor
Fertilizer use has exploded, overloading plants worldwide, likely altering ecosystems for decades to centuries, scientists repor
admin
2018-10-16
69
问题
Fertilizer use has exploded, overloading plants worldwide, likely altering ecosystems for decades to centuries, scientists report Thursday. In the journal Science, a review led by Donald Canfield of the University of Southern Denmark found that fertilizer use worldwide increased 800% from 1960 to 2000. "Given the rising costs of synthetic fertilizer production, this overuse is not only economically expensive, but also initiates a series of large-scale environmental impacts," says the review.
Fundamentally, nitrogen from fertilizers has led to an explosion in "dead zones" in seas and oceans, upsetting a cycle of nutrients balanced with growth that has lasted for billions of years, the authors find.
As well, the excess nitrogen is forming large amounts of nitrous oxide(一氧化二氮), a powerful greenhouse gas in wetlands, adding to climate change. Agriculture today produces about a quarter of the nitrous oxide in the atmosphere.
"The effects of humans have been profound. In the last few decades we have doubled the worldwide biological availability of nitrogen, an element that often limits growth of plants and algae," says Thomas Jordan of the Smithsonian Environmental Research Center in Eclgewater, Md., who was not part of the review. The review, "is a very careful analysis of the nitrogen cycle by three of the world authorities in this area," says biochemist Robert Blankenship of Washington University in St. Louis, who also was not part of the review. "The concerns they raise for how the nitrogen cycle is now significantly out of balance are important and need to be addressed by changing agricultural practices. The world’s food supply depends directly on nitrogen application in the form of fertilizer, but current practices are such that much of the applied nitrogen ends up in rivers and eventually in the ocean where it causes serious problems."
"Natural feedbacks driven by microorganisms will likely produce a new steady state over time scales of many decades," say the review authors. "However, because of the projected increase in human population through at least 2050, there will be demand for an increase in fixed nitrogen for crops to feed this population." And that will mean a lot more dead zones, they warn, like the one that blooms yearly, in 2010 about the size of New Jersey, in the Gulf of Mexico.
"Several new approaches and a much wider use of more sustainable time-honored practices, however, can decrease nitrogen use substantially," they conclude. The rising cost and environmental toll of fertilizers will increase demand for less use on farms, they add. "However, even with management, the future cycle will likely be different from the one that preceded the Industrial Revolution."
Thomas Jordan is most likely to believe that______.
选项
A、the review in Science is not convincing enough
B、the findings of the review in Science are justified
C、humans produce worse effects than nitrogen
D、the effects of nitrogen have been neglected
答案
B
解析
从Thomas Jordan所说的话可以知道,他认同氮对生物和环境造成负面的影响,这个观点与the review对化肥和氮的研究结果相同,由此可推断他最可能认为the review的研究结果是合理的。因此,本题应选B。
转载请注明原文地址:https://kaotiyun.com/show/NfH7777K
0
大学英语六级
相关试题推荐
A、Herbrother.B、Hermother.C、Herboyfriend.D、Herhusband.B推断题。根据ActuallyIwentthereforabreakwithmymother可知她这段时间是和母亲在
Nearlytwo-thirdsofbusinessesintheUKwantto【C1】______staffwithforeignlanguageskills.Frenchisstillthemosthighlyp
Nearlytwo-thirdsofbusinessesintheUKwantto【C1】______staffwithforeignlanguageskills.Frenchisstillthemosthighlyp
A、Britain.B、America.C、Canada.D、China.A细节题。根据开头IsupposethatinBritain,too,familylifehaschangedalotinthelastcentur
A、Onasmallfarmnearariver.B、InabigshopofSeattle.C、OnthecampusofSeattlePacificUniversity.D、InthelibraryofS
长江(theYangtzeRiver)是世界第三长河,中国第一长河,全长6380公里。它发源于青海省,一路无数河流汇入,向东注入东海(theEastChinaSea)。作为中国古文化的发祥地,长江在历史、文化和经济上都对中国的发展有着极其重要的作
然而,不可否认,中国城乡之间、地区之间、行业之间仍然存在巨大收入差距,成为影响社会和谐的重要因素。
A、Playingtheguitar.B、Workingatarestaurant.C、Singinginarockconcert.D、Dancinginaballetrecital.C
IsPaidFamilyLeaveBadforBusiness?A)Paidfamilyleave,whichtopstheagendaofMonday’sWhiteHouseSummitonWorking
A、Trafficaccidents.B、Radiation.C、Traintravel.D、Aircrash.B原文提及“不久前人们认为在太空中会遭遇到严重的威胁,主要有辐射和流星撞击”,故B正确。
随机试题
在跨文化沟通的技能中,消除语言上障碍的途径是()
郁达夫的小说代表作有《沉沦》《春风沉醉的晚上》《屐痕处处》《迟桂花》等。()
奋乃静的含量测定
阿米巴病排包囊者用
建设单位需要使用相邻企业的场地开辟道路就近运输建筑材料。经双方订立合同,约定建设单位向该企业支付用地费用,该企业向建设单位提供场地。在此合同中,建设单位拥有的权利是()。
对账工作主要包括()。
银行本票适用于()需要支付各种款项的单位或个人。
按照承兑人的不同,商业汇票分为()。
Inthedebateovergenetically-alteredfoods,proponentsNikeSenatorRichardLugararguedthatsuchproductswillbeessential
Completethenotesbelow.WriteNOMORETHANTWOWORDSAND/ORANUMBERforeachanswer.EventDetailsExampleTypeofevent:Dra
最新回复
(
0
)