45.The 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."
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
攻击1:according to reports from local hunters, the deer populations are declining
是否真的下降了?
下降了多少?正常范围?
不能迁移是否就会导致减少
攻击2:论断的另一个前提是,气温上升会导致鹿数目下降
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.
时序性因果,其他原因
全球变暖,南极?
是否暖到了不能结冰?
提纲:
1.猎人的报告是否属实?北极鹿的数目是否真的在减少,因为什么原因,报道里并没有说出
2.全球变暖不一定会影响到北极鹿所生活的地方
3.即时全球变暖会影响北极鹿的生活所在,但some of the year表明了北极鹿并不是全年无休地出外觅食
4.气候变暖说不定各小岛上的plants会长的更茂密,北极鹿还不用跑来跑去找吃的呢^^