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    1. “Lacking adequate exposure to the principles of environmental ethics, most practitioners of conservation (especially those emerging from university resource management programs) quickly become missiles without guidance systems.”
  1. Fisheries Biologist
    1.     “Thus far we have considered the problem of conservation of land purely as an economic issue.  A false front of exclusively economic determinism is so habitual to Americans in discussing public questions that one must speak in the language of compound interest to get a hearing.  In my opinion, however, one can not round out a real understanding of the situation in the Southwest without likewise considering its moral aspects.”
“Whether we like it or not, we find ourselves in the midst of a struggle.  Thoughtful people are trying to understand our place in Nature, trying to build a proper social fabric, groping for a code of ethics toward each other and toward Nature.  The current controversies in the diverse field of conservation are an expression of this ethical struggle.  We, as wildlife technicians, cannot escape it... we have a responsibility to contribute to the highest thinking in this field.”
    1. From Leopold's 1923 essay "Some Fundamentals of Conservation in the Southwest"
    1. ALDO
    2. LEOPOLD
    1. OLAUS MURIE
From Murie’s 1954 J. of Wildlife Management essay entitled “Ethics.”
Early on Thomas had thought “wildlife management was a purely scientific endeavor unsullied by…philosophical consideration.”  
 
Later he came to believe in the need to“to stretch out from a technical background to deal with philosophy and ethics.”  
 
Thomas’s second act as Director of the USFS was to begin working on a document entitled “The Forest Service Ethics and a Course to the Future”
    1. JACK W. THOMAS
    1. PHIL PISTER