  His deep green theory is, following his metaphysical and logical pluralism (cf. Sylvan 2000b), also pluralistic “allow[ing] for the requisite theory dependence and cultural relativity of values” (1980a, 156), “there is no uniquely determined correct value system … there are various overlapping systems” though he denies that ethical relativism follows from this (Sylvan 1986, 13). He sees the ongoing cultural project of developing an adequate environmental ethic as being in its early stages.