首页
登录
职称英语
Despite decades of scientific research, no one yet knows how much damage hum
Despite decades of scientific research, no one yet knows how much damage hum
游客
2025-04-20
45
管理
问题
Despite decades of scientific research, no one yet knows how much damage human activity is doing to the environment. Humans are thought to be responsible for a whole host of environmental problems, ranging from global warming to ozone depletion. What is not in doubt, however, is the devastating effect humans are having on the animal and plant life of the planet.
Currently, an estimated 50000 species become extinct every year. If this carries on. the impact on all living creatures is likely to be profound, says Dr. Nick Middleton, a geographer at Oxford University "All species depend in some way on each other to survive. And the danger is that, if you remove one species from this very complex web of interrelationships, you have very little idea about the knock-on effects of other extinctions. "
Complicating matters is the fact that there are no obvious solutions to the problem. Unlike global warming and ozone depletion-which, if the political will was there, could be reduced by cutting gas emissions—preserving biodiversity remains an intractable problem.
The latest idea is "sustainable management" . which is seen as a practical and economical way of protecting species from extinction. This means humans should be able to use any species of animal or plant for their benefit, provided enough individuals of that species are left alive to ensure its continued existence.
For instance, instead of depending on largely ineffective laws against poaching, it gives local people a good economic reason to preserve plants and animals. In Zimbabwe, there is a sustainable management project elephants. Foreign tourists pay large sums of money to kill these animals for sport. This money is then given to the inhabitants of the area where the hunting takes place. In theory, locals will be encouraged to protect elephants, instead of poaching them — Or allowing others to poach them—because of the economic benefit involved.
This sounds like a sensible strategy, but it remains to be seen whether it will work. With corruption endemic in many developing countries, some observers are skeptical that the money will actually reach the people it is intended for. Others wonder how effective the locals will be at stopping poachers.
There are also questions about whether sustainable management is practical when it comes to protecting areas of great-bio-diversity such as the world’s tropical forests. In theory, the principle should be the same as with elephants — allow logging companies to cut down a certain number of trees, but not so many as to completely destroy the forest.
Sustainable management of forests requires controls on the number of trees which are cut down, as well as investment in replacing them. But because almost all tropical forests are located in countries which desperately need revenue from logging, there are few regulations to do this. Moreover, unrestricted logging is so much more profitable that wood prices from managed forests would cost up to five times more—an increase that consumers, no matter how"green", are unlikely to pay.
For these reasons, sustainable management of tropical forests is unlikely to become widespread in the near future. This is disheartening news. It’s estimated these forests contain anything from 50 to 90 percent of all animal and plant species on Earth. In one study of a five-square-kilometer area of rain forest in Peru, for instance, scientists counted 1300 species of butterfly and 600 species of bird. In the entire continental United States, only 400 species of butterfly and 700 species of bird have been recorded.
Scientist Professor Norman Myers sees this situation as a gigantic "experiment we’re conducting with our planet". "We don’t know what the outcome will be. If we make a mess of it, we can’t move to another planet... It’s a case of one planet, one experiment." [br] Why is sustainable management of tropical forests unlikely to be used in the near future?
选项
A、Because tropical forests contain a majority of animal and plant species on Earth.
B、Because we have to wait until the experiment in Peru and the U.S. is finished.
C、Because we have no idea about its effect, and if it fails, our planet will be destroyed.
D、Because besides tropical forests, other areas such as the U.S. also have biodiversity.
答案
C
解析
题目问:为什么热带森林的可持续管理,不可能用在不久的将来?最后一段:We don’t know whatthe outcome will be.If we make a mess of it,we carl’t move to another planet…It’s a case of one planet,oneexperiment.通过这段话可知,我们不知道结果会如何。如果我们搞得一团糟,我们不能搬到另一个星球……这是一个星球,一个实验的问题。据此可知,因为我们不知道它的作用,如果失败,我们的地球将被摧毁。所以,答案是C。
转载请注明原文地址:http://tihaiku.com/zcyy/4045685.html
相关试题推荐
DespiteDenmark’smanifestvirtues,Danesnevertalkabouthowproudtheyar
AndresearcherssaythatlikethoseliteraryromanticsRomeoandJuliet,the
AndresearcherssaythatlikethoseliteraryromanticsRomeoandJuliet,the
AndresearcherssaythatlikethoseliteraryromanticsRomeoandJuliet,the
Inhisresearcheson______diseases,hediscoveredmanyfactsaboutthelungso
Oneofthewrongnotionsaboutscienceisthatmanyscientificdiscoverieshave
Researchdiscoveredthatplantsinfectedwithavirusgiveoffagasthat______
WhatshouldwecallthepersonwhomakesresearchintoCognitiveBehavior[br]W
WhatshouldwecallthepersonwhomakesresearchintoCognitiveBehavior[br]T
Thereareanumberofformatsforreportingresearch,suchasarticlestoapp
随机试题
患者女,32岁。因患甲状腺功能亢进症服用丙基硫氧嘧啶治疗,出现以下哪种情况时需要
角膜血染时,角膜表现为A.基质呈棕黄色 B.后期角膜基质呈褐色 C.后期变为
下列关于β系数的描述,正确的是()A.β系数的绝对值越大。表明证券承担的
合同被宣告无效或被撤销具有溯及力,溯及于合同成立之际,自始不发生固有的法律效()
如图所示,物体A在F的作用下静止在物体B的斜面上,物体B始终静止在水平面上,如果
在丹麦首都哥本哈根的人海口处,塑有一座安徒生童话中的主人公的铜像。这位主人公出自
下列关于砌体房屋抗震计算的论述不正确的是()。A..多层砌体房屋抗震计算
负责组织审查承包人提出的工程变更申请并提出审查意见的是( )。A.总监理工程师
以下对二次回路端子排的设计要求正确的是()。A.正、负电源之间的端子排应排列在
飞机的配载平衡主要由( )系统来完成。A.航班信息处理 B.资源分配 C.
最新回复
(
0
)