I have published widely in environmental philosophy in particular. However, I have since moved on to argue that we need to develop a "General Ethics" (by which I mean "a single, integrated approach to ethics that encompasses the realms of interhuman ethics, the ethics of the natural environment, and the ethics of the human-constructed, or built, environment") and I am the originator of the "theory of responsive cohesion" approach to General Ethics.
I am represented in leading anthologies and encyclopedias in environmental philosophy, have served on the editorial advisory boards of some of the leading journals in the area (including Environmental Ethics, Organization and Environment, and Environmental Values), and my books include:
My main university teaching has been in the areas of ethical theory (i.e., normative ethics and meta-ethics), applied ethics, environmental ethics, the philosophy of conservation, the philosophy of mind, the nature of the interior lives of humans and other animals, and the tangled trio of free will, determinism, and moral responsibility. I have also lectured or given papers internationally to a wide range of university and broader general interest audiences in countries ranging from Australia, Bermuda, England, Finland, Germany, Greece, and Italy to Japan, the Netherlands, New Zealand, Scotland, Sweden, and the US.