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发表于 2008-7-22 22:41:07
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45The following appeared as an editorial in a wildlife journal.
"Arctic deer live on islands in Canada's arctic region. They search for food by moving over ice from island to island during the course of a year. Their habitat is limited to areas warm enough to sustain the plants on which they feed, and cold enough, at least some of the year, for the ice to
cover the sea separating the islands, allowing the deer to travel over it. Unfortunately, according to reports from local hunters, the deer populations are declining. Since these reports coincide with recent global warming trends that have caused the sea ice to melt, we can conclude that the decline in arctic deer populations is the result of deer being unable to follow their age-old migration patterns across the frozen sea."
字数:496
In this argument, the author asserts that the declination of the population of deer is due to the warm trends, which interrupts the ice over which the deer travel. To support his assertion, the arguer quotes the report from the hunter. Though this argument seem to be sound and credible, it contains severe logical fallacies, which render the conclusion hard to believe.
First of all, the arguer cites reports from local hunters to illustrate the decreasing population of deer. However, the hunter do not have strong evidence such as records of the population of deer to show that the population of deer is decreasing, but they just make the judgment by their experience. And it is entirely possible that arctic deer change their usual way to avoid the chasing of local hunters, which definitely would cause hunters to observe less deer. In this consequence, reports from local hunters do not sound as reliable as thought to be and the arguer should research further on the reports offered by local hunters
Furthermore, as the author claims, the decrease of deer is a coincide with recent global warming trends, even though we assure the authentic of hunters' reports. Although the decline of arctic deer and the warm trends happen together, it would be unwarranted to conclude the former is caused by the latter and they are only the coincident. Therefore, there are a hundred possible reasons to lead to the decline of the population of arctic deer. For instance, deer are almost extinct under the excessive hunting of local hunters or polar beers, which feed on the arctic deer are
increasing and cause the decline of arctic deer in numbers. Thus without ruling out such possible reasons, the arguer should not make the conclusion that the warm trends is responsible for the decrease of arctic deer.
Finally, admittedly that warm trends do effect the living environment of arctic deer, but we should not haste to conclude that the warm trends result in the prohibition of the migration of arctic deer not on the precise study but only on oversimplified deduce. Although the warm trends cause the milt of ice, it also could be the cause of other unusual phenomenon, which also attribute to the decrease of populations of deer, such as: the warm trends excess the temperature limits under which the plants arctic feed on to grow and the shortage of food causes the death of most of deer. Thus, the arguer should study on every possibility before the conclusion.
To sum up, the author make such a illogical and unwarranted conclusion without any precise study or strict research. To make the argument sound and acceptable, the author should offer the report of the authentic. In order to strength the argument, he should do more exploration on the relationship between the warm trends and the decline of population of deer and rule out other possible results that warm trends would cause to influence the population of artic deer. |
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