Biologists are often placed in the difficult position of defending a threatened habitat or animal with vague reasoning and faulty logic, simply because they have no better rationale at their immediate disposal. This places them at a distinct disadvantage and literally at the mercy of resource exploiters and their easily assignable dollar values. Although the initial dollar cost of delaying precluding "developing" may be significant, the long-term benefits of saving the biological entities which might otherwise be destroyed are likewise great and are measurable in concrete terms which society is only now beginning to appreciate. Case histories are presented, a more profound rationale is explained, and the environmentalist is challenged to make his case sufficiently effective to reverse the current exploitive trends which threaten so many of earth's life forms.
Pister, Edwin P.
"Endangered species: costs and benefits,"
Great Basin Naturalist Memoirs: Vol. 3
, Article 18.
Available at: http://scholarsarchive.byu.edu/gbnm/vol3/iss1/18