- "Utilitarianism and the Evolution of Professional Ethics," forthcoming in Science and Engineering Ethics.
- "Personhood, Memory, and Elephant Management," invited contribution to Christen Wemmer and Catherine Christen eds., Elephants and Ethics: The Morality of Coexistence, Johns Hopkins University Press (forthcoming).
- Encyclopedia entry on "Culling" (1000 words), forthcoming in the Encyclopedia of Environmental Ethics and Philosophy, edited by J. Baird Callicott and Robert Frodeman (forthcoming from Thomson Gale Publishers).
- "A Ética e o Ambiente" ["Ethics and the Environment," translated by Vanda Alves Monteiro and Humberto D. Rosa], in Humberto D. Rosa, ed., Bioética para as Ciências Naturais (Fundação Luso-Americana para o Desenvolvimento, Lisboa, Portugal 2004), pp. 161-180.
- "Animals," invited chapter in Life Science Ethics, Gary Comstock, ed. (Iowa State University Press, 2002), pp. 141-68.
- Invited chapter on "Biocentric Individualism," in David Schmidtz and Elizabeth Willott, eds., Environmental Ethics: What Really Matters, What Really Works (Oxford University Press, 2002), pp. 108-120.
- Invited chapter on "Pets, Companion Animals, and Domesticated Partners," in Ethics for Everyday, David Benatar, ed. (McGraw-Hill, 2002), pp. 450-75.
- "Scientific and Ethical Questions About Animal Somacloning," Biotechnology International III: The Biotech Millennium" (San Francisco: Universal Medical Press, 2001), pp. 56-60.
- "Sentientism," invited chapter in Dale Jamieson, ed., A Companion to Environmental Philosophy (Blackwell, 2001), pp. 192-203.
- "Reconfiguring Borders: Health-Care Providers and Practical Environmentalism in Cameron County, Texas" (with Tarla Rai Peterson, Susan J. Gilbertz, Kathi Groenendyk, and Jay Todd), Women's Studies Quarterly 29 (2001), pp. 51-63.
- Encyclopedia entry on "Cloning, Overview of Animal Cloning" in The Encyclopedia of Ethical, Legal and Policy Issues in Biotechnology, Maxwell J. Mehlman and Thomas H. Murray, eds. (John Wiley and Sons, 2000), pp. 139-148; an updated version appeared in an on-line version of the encyclopedia in 2002..
- "Prolegomena to Any Future Artificial Moral Agent" (with Colin Allen and Jason Zinser), Journal of Experimental and Theoretical Artificial Intelligence 12 (2000), pp. 251-61.
- "Should You Clone Your Dog?"Animal Welfare (Britain), 8 (1999), pp. 407-420.
- "How Facts Matter: On the Language Condition and the Scope of Pain in the Animal Kingdom," Pain Forum 8 (1999), pp. 84-86.
- Encyclopedia entries on "Hunting: Environmental Ethics and Hunting" and "Vegetarian Diets: Ethics and Health" in Marc Bekoff, ed., Encyclopedia of Animal Rights and Animal Welfare (Greenwood Press, 1998).
- "The Takings Issue and Two Visions of Humans' Relations to Nature," Journal of Human Ecology 3 (1997), #1, pp. 12-15.
- "Can Animal Rights Activists be Environmentalists?" invited paper in Donald Marietta and Lester Embree, eds., Environmental Ethics and Environmental Activism (Rowman & Littlefield, 1995), pp. 169-201.
- "Teaching Environmental Ethics as a Method of Conflict Management" (with Susan Gilbertz and Tarla Rai Peterson), in Andrew Light and Eric Katz, eds., Environmental Pragmatism (Routledge, 1996), pp. 266-82.
- "Environmental Law and the Eclipse of Land as Private Property," in Frederick Ferre and Peter Hartel, eds., Ethics and Environmental Policy: Theory Meets Practice (University of Georgia Press, 1994), pp. 142-60.
- "What's Wrong with Animal Byproducts?" Journal of Agricultural and Environmental Ethics 7 (1994), pp. 7-17.
- "In Defense of the Vegan Ideal: Rhetoric and Bias in the Nutrition Literature," Journal of Agricultural and Environmental Ethics 7 (1994), pp. 29-40.
- "Rejoinder to Kathryn Paxton George," Journal of Agricultural and Environmental Ethics 7 (1994), pp. 83-86.
- "The Propects for Consensus and Convergence in the Animal Rights Debate," Hastings Center Report January/February 1994, pp. 23-27.
- Encyclopedia entries on "Animal Rights," "Sentience," "Vegetarianism," and "Vivisection" in Ready Reference: Ethics (Salem Press, 1994).
- "On the Moral Status of Fish," Aquatic Conservation 2(2), 1993, pp. 9-10.
- "No Holism Without Pluralism," Environmental Ethics 13 (1991), pp. 175-79.
- "Agricultural Research Policy, Environmental Quality, and Animal Welfare" (with Paul Thompson and Deborah Tolman), in Paul Thompson and Bill Stout, eds., Beyond the Large Farm: Ethics and Research Goals for Agriculture (Westview, 1991), pp. 217-36.
- "Rejoinder: More on the Ethics of Captive Breeding" (with Martha C. Monroe), Endangered Species UPDATE, vol. 8, #11 (September, 1991), p. 6 (rejoinder to published criticism of following article).
- "Ethical Perspectives on Captive Breeding: Is it For the Birds?" (with Martha C. Monroe), Endangered Species UPDATE, vol. 8, #1 (November, 1990), pp. 27-29 (invited paper in special issue on captive breeding).
- "Species, Individuals, and Domestication," Between the Species 6 (1990), pp. 181-84.
- "Biological Functions and Biological Interests," Southern Journal of Philosophy 28 (1990), pp. 251-70.
- "Congress, Consistency, and Environmental Law: Nuclear Waste at Yucca Mountain, Nevada" (with John Lemons & Donald Brown), Environmental Ethics 12 (1990), pp. 311-27 (on the National Environmental Policy Act of 1969 and the nuclear waste disposal issue).
- "Do Species Have Standing?" Environmental Ethics 9 (1987), pp. 57-72 (on the Endangered Species Act of 1973).
- "The Schopenhauerian Challenge in Environmental Ethics," Environmental Ethics 7 (Fall, 1985), pp. 209-29.