Gorke (environmental ethics, U. of Greifswald, Germany) outlines a scheme of justification for a concept of ethics that grants intrinsic value not only to humans but also to all natural entities and entire systems, including species. Nevers (biology, U. of Hamburg) translated Artensterben, published by J. G. Catta'sche Buchhandling Nachfolger, Stuttgart, in 1999, which is based on Gorke's doctoral dissertation.