首页
登录
职称英语
The past 50 years have seen massive expansion of agriculture, with food prod
The past 50 years have seen massive expansion of agriculture, with food prod
游客
2024-04-27
2
管理
问题
The past 50 years have seen massive expansion of agriculture, with food production more than doubling in order to meet demand. But it has left us with 60% of all ecosystem services degraded, accelerated species extinction, and huge loss in genetic diversity. Currently, four plant species wheat, maize, rice and potato- provide more than half of the plant-based calories in the human diet, while about a dozen animal species provide 90% of animal protein consumed globally.
As the agricultural frontier has expanded, those farmers previously dependant on a more diverse source of livelihood have converted to cash crops. As traditional varieties and breeds die out, so too do the traditional knowledge and practices of local farmers. The focus on agricultural commodities rather than on food production to meet the basic needs of people has undermined diversity and self-reliance, and left farmers vulnerable to volatile markets, political instability and environmental change.
Increased food production in some parts of the world has been at the expense of natural and semi-natural ecosystems that provide us greater long-term security. In Britain, studies have shown that hay production is higher in meadows with a greater number of species. In Australia, crop yields are higher in regions where native biodiversity has been preserved. In the seas, too, areas with a higher number of conserved species generate more fish for humans to catch and eat. There are many other examples from land and sea to show that a healthy environment means more food and a greater capacity to survive natural disasters.
The current food crisis, meanwhile, will only be exacerbated by climate change, with southern Africa and South Asia expected to be particularly badly affected.
So what are the solutions to feeding a growing world population in the face of climate change? We have been hearing about a Green Revolution for Africa, major irrigation and fertilization programs, genetically modified seed varieties, as well as banning the use of crops for bio-fuel production. Amazingly, there is very little attention being paid to what fundamentally underpins(支持)all of our food systems— biodiversity and the services provided by ecosystems, such as soil, water and resilience to disasters. We have to change the economic rules of current food production systems. We must eliminate agricultural and fisheries subsidies that support elites in the North, and get rid of protectionist measures in OECD(Organization for Economic Cooperation and Development)countries for agricultural products. We have to allow for value-added trade for the benefit of the South, and expand fair trade and labeling processes that create incentives and add benefits to producers in the South. We must change food production systems, moving from the existing model based on high inputs accessible through markets, to systems based on locally available and more environmentally-friendly inputs. [br] What has resulted in the degradation of the ecosystem for the past 50 years?
选项
A、The sustainable development of agriculture.
B、The human’s destruction to the environment.
C、The human’s demand for biological diversity.
D、The increasing demand in food production.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3573883.html
相关试题推荐
Thepast50yearshaveseenmassiveexpansionofagriculture,withfoodprod
Thepast50yearshaveseenmassiveexpansionofagriculture,withfoodprod
Thepast50yearshaveseenmassiveexpansionofagriculture,withfoodprod
Thepast50yearshaveseenmassiveexpansionofagriculture,withfoodprod
CampusCrimeWeoftenthinkofagricultureaspl
CampusCrimeWeoftenthinkofagricultureaspl
CampusCrimeWeoftenthinkofagricultureaspl
Massivechangesinalloftheworld’sdeeplycherishedsportinghabitsareu
Massivechangesinalloftheworld’sdeeplycherishedsportinghabitsareu
Massivechangesinalloftheworld’sdeeplycherishedsportinghabitsareu
随机试题
[originaltext]Theworld’sfirstgunmadewith3Dprintertechnologyhasbee
PRODIGIOUS:PERSON::A、lunatic:preoccupationB、heathen:maverickC、patriotic:d
ThismaycomeasnosurprisetoresidentsofNewYorkCityandotherbigurb
Text2AstudypublishedintheInternat
电流互感器的准确级指在规定的二次负荷变化范围内,二次电流为额定值时的最大电流误差
A
混凝土初步配合比为1:1.82:3.60,W/C=0.50,混凝土的假定表观密度
工程背景资料如下: 1.图6.III所示为某汽车库动力配电平面图。
不寐之心脾两虚证的主治方剂是A.归脾汤 B.龙胆泻肝汤 C.黄连温胆汤 D
某工程,施工总承包单位(以下简称“乙方”)按《建设工程施工合同(示范文
最新回复
(
0
)