Abstract

A central task of environmental ethics, which have been arising since 1960s, is to extend the objects of moral concern beyond the individuals of Homo sapiens.. On the other hand, if we broadly define the environmental ethic as an ethic that shows moral concern not limited to Homo sapiens and its individuals only, then, these “generalized” environmental ethics include Peter Singer’s “animal liberation” and Tom Regan’s “animal rights”. In this article, the term “environmental ethic” refers to an environmental ethic in a generalized sense.) All the objects deserving moral concern constitute the moral community. The trajectory and boundary of this extension are different among different schools. Compared to other schools, Tom Regan’s “animal rights” has a relatively smaller moral community, making it more “conservative” at first sight. Meanwhile, the rights view, like other schools, faces the question regarding the edge of moral concern. This question consists of two sub-questions: where is the boundary of the moral community and how ought we to treat the objects of moral concern near the boundary? Given the closeness of Regan’s theory to traditional ethics, this study is mainly focused on analyzing the edge of moral concern within the framework of the theory of animal rights. Further, I investigate the similarities and differences in the boundary of moral concern among various schools of environmental ethics. The comparative analysis demonstrates a subtle relation between science and moral philosophy, and reveals a similar form of a metaphysical premise adopted by all environmental ethics. This research helps to clarify the moral concern of environmental ethics, which is an essential prerequisite for establishing a new ethic, and therefore helps to consolidate the reference of environmental ethics to environmental management.