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
Facing water shortages and escalating fertilizer costs, farmers in developing countries are using raw sewage(下水道污水)to irrigate a
Facing water shortages and escalating fertilizer costs, farmers in developing countries are using raw sewage(下水道污水)to irrigate a
admin
2021-01-08
36
问题
Facing water shortages and escalating fertilizer costs, farmers in developing countries are using raw sewage(下水道污水)to irrigate and fertilize nearly 49 million acres of cropland, according to a new report—and it may not be a bad thing.
While the practice carries serious health risks for many, those dangers are outweighed by the social and economic gains for poor urban farmers and consumers who need affordable food.
" There is a large potential for wastewater agriculture to both help and hurt great numbers of urban consumers," said Liqa Raschid-Sally, who led the study.
The report focused on poor urban areas, where farms in or near cities supply relatively inexpensive food. Most of these operations draw irrigation water from local rivers or lakes. Unlike developed cities, however, these areas lack advanced water-treatment facilities, and rivers effectively become sewers(下水道).
When this water is used for agricultural irrigation, farmers risk absorbing disease-causing bacteria, as do consumers who eat the produce raw and unwashed. Nearly 2. 2 million people die each year because of diarrhea-related(与腹泻相关的)diseases, according to WHO statistics. More than 80% of those cases can be attributed to contact with contaminated water and a lack of proper sanitation. But Pay Drechsel, an environmental scientist, argues that the social and economic benefits of using untreated human waste to grow food outweigh the health risks.
Those dangers can be addressed with farmer and consumer education, he said, while the free water and nutrients from human waste can help urban farmers in developing countries to escape poverty.
Agriculture is a water-intensive business, accounting for nearly 70% of global fresh water consumption.
In poor, dry regions, untreated wastewater is the only viable irrigation source to keep farmers in business. In some cases, water is so scarce that farmers break open sewage pipes transporting waste to local rivers.
Irrigation is the primary agricultural use of human waste in the developing world. But frequently untreated human waste harvested from lavatories is delivered to farms and spread as fertilizer.
In most cases, the human waste is used on grain crops, which are eventually cooked, minimizing the risk of transmitting water-borne diseases. With fertilizer prices jumping nearly 50% per metric ton over the last year in some places, human waste is an attractive, and often necessary, alternative.
In cases where sewage mud is used, expensive chemical fertilizer use can be avoided. The mud contains the same critical nutrients.
"Overly strict standards often fail," James Bartram, a WHO water-health expert, said. "We need to accept that fact across much of the planet, so waste with little or no treatment will be used in agriculture for good reason. "
What is the main problem caused by the use of wastewater for irrigation?
选项
A、Rivers and lakes nearby will gradually become contaminated.
B、It will drive producers of chemical fertilizers out of business.
C、Farmers and consumers may be affected by harmful bacteria.
D、It will make the farm produce less competitive on the market.
答案
C
解析
细节理解题。定位句指出,使用污水进行农业灌溉,会产生健康风险:农民和那些生食未经清洗的农产品的消费者可能会摄入由细菌引发的疾病,故答案为C)。
转载请注明原文地址:https://kaotiyun.com/show/NZP7777K
0
大学英语六级
相关试题推荐
A、MostadvertisementsonTVarecheatingconsumers.B、WatchingTVcostsusmuchmoney.C、Peoplespendtoomuchtimewatchinguse
Manycountrieshaveaholidaytocelebrateworkers’rightsonoraroundMay1,butLabourDayinCanadaiscelebratedonthefir
Intheworldofentertainment,TVtalkshowshaveundoubtedlyfloodedeveryinchofspaceondaytimetelevision.Andanyonewho
Intheworldofentertainment,TVtalkshowshaveundoubtedlyfloodedeveryinchofspaceondaytimetelevision.Andanyonewho
Itseemslogical:Collegegraduateshavelowerunemploymentandearnmorethanlesseducatedworkers,so,thethinkinggoes,the
Itseemslogical:Collegegraduateshavelowerunemploymentandearnmorethanlesseducatedworkers,so,thethinkinggoes,the
ThereportfromtheBureauofLaborStatisticswasjustasgloomyasanticipated.UnemploymentinJanuaryjumpedtoa16-yearhi
Asforsalaryandinterest,whichismoreimportantinjob-hunting?Differentpeoplehavedifferentanswers.Writeacomposition
Maybeunemploymentisn’tsobadafterall.Anewstudysaysthat,incomenotwithstanding,havingademanding,unstableandthank
随机试题
存活率最高的移植方法是()
人流术时病人恶心、呕吐、血压下降,脉搏缓慢,最可能的原因是闭经52天,下腹坠痛伴阴道出血2小时,量多。1周前B超示宫内孕,最常见的情况为
需求量变动率大于价格变动率
下列关于助悬剂的错误表述是()
案情:2016年1月10日,自然人甲为创业需要,与自然人乙订立借款合同,约定甲向乙借款100万元,借款期限1年,借款当日交付。2016年1月12日,双方就甲自有的M商品房又订立了一份商品房买卖合同,其中约定:如甲按期偿还对乙的100万元借款,则本合同不履行
下列属于总需求构成的是()。
下列属于过滤式除尘器的是()。
马斯洛假设人类需求的强度按由低到高相互递进的顺序分为五个层次,层次越低的需求,其强度越小;层次越高的需求,其强度增强。
下列各项中说法正确的有()。
[资料一]甲企业采用应收账款余额百分比法核算坏账损失。2013年1月1日,“应收账款”账户的余额为1000000元,坏账准备账户的余额为5000元;2013年12月31日,“应收账款”账户的余额为800000元,2013年末应计提的坏账
最新回复
(
0
)