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
2025-04-17
31
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 50,000 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 e-missions—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 1,300 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 what the outcome will be.If we make a mess of it,we carl’t move to another planet.…It’s a case of oneplanet,one experiment.”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:https://www.tihaiku.com/zcyy/4040998.html
相关试题推荐
Despitethegeneralnegativefindings,itisimportanttorememberthatall
Asresearcherslearnmoreabouthowchildren’sintelligencedevelops,theya
Asresearcherslearnmoreabouthowchildren’sintelligencedevelops,theya
Asresearcherslearnmoreabouthowchildren’sintelligencedevelops,theya
Thescientificcommunitywas______whenalivingspecimenofthecoelacanth,long
Aconsiderableamountofmedicalresearchisaimedatidentifyingriskfacto
Aconsiderableamountofmedicalresearchisaimedatidentifyingriskfacto
Aconsiderableamountofmedicalresearchisaimedatidentifyingriskfacto
Aconsiderableamountofmedicalresearchisaimedatidentifyingriskfacto
Aconsiderableamountofmedicalresearchisaimedatidentifyingriskfacto
随机试题
[A]price[B]airport[C]supermarket[D]check[E]change[F]hotel[G]hospita
Theestimatesofthenumbersofhome-schooledchildrenvarywidely.TheU.S
Itisnouse(tell)______himwhattodonext.tellingItisnouse+doing是一个习惯用法。
A公司财务部门的统计数据如表2所示: 请根据上述资料回答下列问题: 下列
以下关于发行人首次公开发行股票后申请其股票在上交所上市应当符合的条件中,描述正确
下列哪项不属于城市燃气工程系统的主要内容?()A.石油液化气储存站 B.水
银行进行信贷市场细分的根本依据为()。A:客户需求的共同性B:客户需求的差异性
关于投保人在订立保险合同时的告知义务,下列哪些表述是正确的?A:投保人的告知义务
属于水溶性软膏基质的有A.蜂蜡 B.甘油明胶 C.聚乙二醇 D.液状石蜡
肺气虚弱或肾不纳气的表现为A.仰面伸足,常揭衣被 B.坐而仰首,不得平卧 C
最新回复
(
0
)