What is the difference between the humanistic position of environmental ethics and the naturalistic or biocentric position in environmental ethics?

Please read W. Micheal Hoffman’s “Business and Environmental Ethics” pp. 5201. Why does Hoffman disagree with Norman Bowie on the moral obligation of a corporation to the environment? (Section I)2. What is the difference between the humanistic position of environmental ethics and the naturalistic or biocentric position in environmental ethics? (Section III)3. Why does Hoffman endorse the biocentric position? What does it imply for business ethics? (Section III)4. Do you agree with Hoffman that the biocentric position should be adopted for making moral decisions in a business context? Why or why not?