Environmental Ethics, المجلد 1

aesthetic Aldo Leopold alternative altruism American analysis Animal Liberation Animal Rights areas argue argument attitudes Barry Commoner beauty behavior biological Charles Hartshorne claim Commoner complex concept concern conservation creatures decision Department of Philosophy duties ecological economic ecosystem endangered species entity environment environmental ethics environmental problems environmentalists essay example existence fact follow nature forests future genetic Hardin human Ibid individual interest intuitions issues John John Muir journal justice L. W. Sumner land landscape limitations living man's Mexico moral agent moral milieu moral principles National natural environment nonhuman animals obligation organic Passmore persons Peter Singer physical possible preservation preservationist properties question R. V. Young reason reciprocal altruism reciprocity relation Rolston Sand County Almanac scientific self-conscious sense sentience Singer social society sociobiology theory things tion Tom Regan understanding University utilitarian utility Western wilderness wildlife York