- 最后登录
- 2008-7-14
- 在线时间
- 0 小时
- 寄托币
- 796
- 声望
- 0
- 注册时间
- 2006-8-22
- 阅读权限
- 20
- 帖子
- 0
- 精华
- 0
- 积分
- 411
- UID
- 2245298
 
- 声望
- 0
- 寄托币
- 796
- 注册时间
- 2006-8-22
- 精华
- 0
- 帖子
- 0
|
发表于 2007-2-14 09:46:26
|显示全部楼层
Argument 131
131The following appeared in an environmental newsletter published in Tria Island.
"The marine sanctuary on Tria Island was established to protect certain marine mammals. Its regulations ban dumping and offshore oil drilling within 20 miles of Tria, but fishing is not banned. Currently many fish populations in Tria's waters are declining, a situation blamed on pollution. In contrast, the marine sanctuary on Omni Island has regulations that ban dumping, offshore oil drilling, and fishing within 10 miles of Omni and Omni reports no significant decline in its fish populations. Clearly, the decline in fish populations in Tria's waters is the result of overfishing, not pollution. Therefore, the best way to restore Tria's fish populations and to protect all of Tria's marine wildlife is to abandon our regulations and adopt those of Omni."
---正文---
The seeming sound argument draws the conclusion that to abandon regulations in Tria Island and adopt those in Omni is the best way to restore Tria's fish and protect all of Tria's marine wildlife. However, based on dubious evidence and illogical reasoning, the argument is far from perfect,
To begin with, the author of the newsletter fails to establish a causal relationship between the decline in fish population and overfishing in Tria Island. Other alternative explanations are overlooked by the author. For one thing, other sources of pollution should be considered, such as pollution caused by rivers flowing into the marine sanctuary, and dumping or oil drilling beyond 20 miles of Tria which maybe so serious that the pollution in water or sound affect the living of fishes in the sanctuary. For anther, the climate and season will greatly influence the population of fishes. Common sense tells us that fishes tend to decline in winters or suddenly cold water caused by ocean currents since the living conditions becomes unsuitable and food is in short. Moreover, fish may immigrate in certain seasons, which, of course, would result in the decline in the population of the fish. Without considering all these alternatives, the deduction of the author is open to doubt.
Further, even if the decline in the fish population is a result of overfishing, it is highly dubious that regulations implemented in Omni will be applicable in Tria. On one hand, whether the regulations applied in Omni are effective is in suspect. That no significant decline in fish in omni was reported doesn't indicate fish population didn’t decline. Maybe there was significant decline but was not reported. Or the decline, through not significant, is more serious than the decline in Tria. If these were true, the author' recommendation should be reconsidered. On the other hand, difference between the two islands may outweigh their similarities. For example, the kinds of fish , the climates and temperatures, the quality of water and the like may vary in the two waters, thus calling for different regulations suitable for the specific conditions.
In addition, the regulations which may be effective in protecting fish are not necessarily applicable for all the other marine wildlife. Various marine wildlife have different living style. Consequently, measures effective for protecting fish cannot cover all the needs for protecting all the marine lives.
After careful consideration, the author lacks both sufficient evidence and precise reasoning to make a sound argument. The argument can be improved if the author could make a thorough investment into at least the above three issues, thus providing solid evidence to prove that overfishing is the cause for the decline in fish population in Tria and the best way is to adopt regulations of Omni. |
|