As an alternative to consequentialism and deontology both of which consider “thin” concepts such as “goodness” and “rightness” as essential to morality, virtue ethics proposes to understand morality — and assess the ethical quality of actions — in terms of “thick” concepts such as “kindness”, “honesty”, “sincerity” and “justice”. As virtue ethics speaks quite a different language from the other two kinds of ethical theory, its theoretical focus is not so much on what kinds of things are good/bad, or what makes an action right/wrong. Indeed, the richness of the language of virtues, and the emphasis on moral character, is sometimes cited as a reason for exploring a virtues-based approach to the complex and always-changing questions of sustainability and environmental care (Sandler 2007). One question central to virtue ethics is what the moral reasons are for acting one way or another. For instance, from the perspective of virtue ethics, kindness and loyalty would be moral reasons for helping a friend in hardship. These are quite different from the deontologist’s reason (that the action is demanded by a moral rule) or the consequentialist reason (that the action will lead to a better over-all balance of good over evil in the world). From the perspective of virtue ethics, the motivation and justification of actions are both inseparable from the character traits of the acting agent. Furthermore, unlike deontology or consequentialism the moral focus of which is other people or states of the world, one central issue for virtue ethics is how to live a flourishing human life, this being a central concern of the moral agent himself or herself. “Living virtuously” is Aristotle’s recipe for flourishing. Versions of virtue ethics advocating virtues such as “benevolence”, “piety”, “filiality”, and “courage”, have also been held by thinkers in the Chinese Confucian tradition. The connection between morality and psychology is another core subject of investigation for virtue ethics. It is sometimes suggested that human virtues, which constitute an important aspect of a flourishing human life, must be compatible with human needs and desires, and perhaps also sensitive to individual affection and temperaments. As its central focus is human flourishing as such, virtue ethics may seem unavoidably anthropocentric and unable to support a genuine moral concern for the nonhuman environment.

But just as Aristotle has argued that a flourishing human life requires friendships and one can have genuine friendships only if one genuinely values, loves, respects, and cares for one’s friends for their own sake, not merely for the benefits that they may bring to oneself, some have argued that a flourishing human life requires the moral capacities to value, love, respect, and care for the nonhuman natural world as an end in itself (see O’Neill 1992, O’Neill 1993, Barry 1999).