Arctic deer live on islands in Canada’s arctic regions. They search for food by moving over ice from island to island during the course of the 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 purported decline in deer populations is the result of the deer’s being unable to follow their age-old migration patterns across the frozen sea.
根据刚才的递进式原则,第一个该攻击的事相对而言比较轻微逻辑漏洞:调查数据不可靠。
文中只是简短地一笔带过 “according to reports from local hunters” 其中没有提到猎人的人数,以及他们所观察到的鹿的数量的下降这一现象是否普遍。
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所以报告的代表性是无法判定的。第一个主体段可以对此进行攻击。
下面的主体段可以先假设刚才的报告的代表性是足够的:
“Even if the number of the hunters who have seen the declining deer population is large enough…”
然后再说明另外一个报告结果的逻辑错误:以大范围强行代表小范围。
文中提到:“recent global warming trends” 最近的全球变暖趋势,但是这趋势不一定会影响到Canada’s arctic regions。
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