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121. "At various times in the geological past, many species have become extinct as a result of natural, rather than human, processes. Thus, there is no justification for society to make extraordinary efforts, especially at a great cost in money and jobs, to save endangered species."
1. 首先区别自然灭绝和由于人类活动灭绝的不同
2. 由于人类的活动造成物种大量灭绝的坏处
(1) 破坏了生态平衡
(2) 造成生物圈的单一化,人类可选择的不同类型的生存环境减少
3. 保护生物物种并不是浪费了金钱,而是一种回报很高的投资,更何况保护生物也为社会提供了很多就业的机会。
Should the society make extra efforts to prevent endangered species from extinction? Facing this complex issue, basically I have to acknowledge that some species do disappear for the reason of nature, but as far as I am concerned the impact human activities have on the living environments is pushing endangered species to the edge of abyss-extinction. Thus, I should claim that the society and government has the accountability to save these species at any cost.
To begin with, it is significant to distinguish the difference of natural extinction and extinction cause by human. On one hand, alone the extreme long natural history, great amounts of species disappear from the earth in accordance with Darwin’s evolution theory. And the extinction of former species is the result of the appearance of another more advanced species. For instance, millions of years ago, the giant dinosaur died partly due to the geological movement, but, to large extent, the reason for the extinction of dinosaur was a shortage of food supply. Their food resource was replaced by the more advanced flowers. Consequently, even though dinosaur disappeared, the total amount of species was not seriously decreased. On the other hand, human activities did and do destroy the living environment of numerous species, as a result, the limited living resource and bad living condition accelerate the extinction of species. Comparing to the former aspect, human activities do not lead to new kinds of animals coming into being, under this circumstance, the total number on the species list keeps on decreasing.
Based on the differentiation of natural and men-made extinction, I should point out several bad effects caused by human activities as follow.
First of all, abnormal extinction of animals scares the balance in ecosystem. Every kind of animals plays their own role in the chain of food, so the disappearance of one loop in the chain might result in serious tragedy in ecosystem-the species above might die out for the insufficient food supply, and the species below might grow without proper control. Taking owl for instance, excessive hunting of owl may lead to an increasing number of field mice, and as a result crops are serious damaged by the mice. Ultimately, it is human being ourselves whose profit is disturbed.
What’s more, excessive decrease of species would result in a lack of diversity in both ecosystem, and further human being would also face the dilemma of insufficient choices of living environment. In recent years, wild species are disappearing at a high speed, so we can only see some endangered animals in the zoos, let alone the close contact. Further, in the near future it is quite possible that we live in all men-made, eat all men-raise, and so forth. Accordingly, the quality of people’s daily lives is much scared, as a lack of diverse life patterns.
Under this circumstance, protecting the endangered species is not a waste of money and human resource, but a most profitable investigation. A balanced bio-cycle, which needs the diversity of species greatly, is able to bring a better living environment to human beings, and further a decreasing amount of natural disasters, thus, the money and manpower spent to prevented human civilizations from being ruined by natural tragedy can be transmitted to promote the quality of people’s lives. To this extent, to protect endangered species is to benefit ourselves, even in indirect methods. Further, in the process of protection, an increasing amount of jobs are available to alleviate the job-hunting stress.
To sum up, even some species disappear for natural reasons, but people should not neglect the fatal effect that human activities have on the bio-cycle. So, it is quite recommended that all governments and social powers devote to protecting the endangered species.
倒数第3段写的实在惨不忍睹。。。不过也懒的改了。。。
[ Last edited by forevera on 2005-8-25 at 13:53 ] |
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