Constructing a DN Account of Leopold’s Essay (Thinking Like a Mountain);
1. Constructing a DN explanation for Leopold’s article “Thinking Like a Mountain”; For the original text, see http://www.pep.com.cn/200406/ca429154.htm 1) Any animal’s survival requires enough food. —— universal law 2) Any animal can obtain food only within its own range of activity. —— universal law 3) If there is not enough food within its range of activity, then that animal cannot obtain enough food. —— corollary of 2 4) If there is not enough food source within its range of activity, then that animal cannot maintain survival. —— corollary of 1 and 3 5) If a group of animals remains stable in a certain place, then there must be a stable…
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