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.
The argument indicates that the number of Arctic deer diminishes is due to global warming trends. To support this assertion, the author points out that the usual living style of deer which lives in warm enough areas to nurture the plants they feed on and cold enough to assure that ice covers the sea separating the islands, and then try to convince us that the trends of global warming is ascribed to the decreasing of Arctic deer. I find the assertion specious on several grounds.
To begin with, the author states that Arctic deer search for food by moving across the frozen sea to the opposite side of the island. However, there is no evidence being cited to substantiate this activity. Without further evidences, the deer will be able to search for food at the island they live.
Secondly, the reports from local hunters is not convincing for some reasons. Perhaps the hunters didn't go to the right place that most deer appear or their tracing skills weren't as good as professions. And the decreasing population they discovered maybe just the intuition they got because they are unable to hunt the as much as they did before. The deer might learn that it's dangerous to be close to human beings and do their best to stay away from human beings at the moment they see people.
Finally, the author assumes that due to global warming, the weather is not cold enough to make sure that the volume of ice to cover the sea separating the islands which deer always travel over. The assumption is untenable because the author fails to provide evidence to the relationship between the age-old migration patterns and global warming.
In sum, to make the assumption more convincing, the author must provide clearer and more persuasive evidences to support the influences caused by global warming that decrease the number of Arctic deer.
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