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What is ethics? Where do moral standards come from? Are they based on emotions, reason, or some innate sense of right and wrong? For many scientists, the key lies entirely in biology--especially in Darwinian theories of evolution and self-preservation. But if evolution is a struggle for survival, why are we still capable of altruism?

In his classic study The Expanding Circle, Peter Singer argues that altruism began as a genetically based drive to protect one's kin and community members but has developed into a consciously chosen ethic with an expanding circle of moral concern. Drawing on philosophy and evolutionary psychology, he demonstrates that human ethics cannot be explained by biology alone. Rather, it is our capacity for reasoning that makes moral progress possible. In a new afterword, Singer takes stock of his argument in light of recent research on the evolution of morality.

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The Expanding Circle
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Touchstones of ethics
January 3rd, 2015
Singer shows us that right-and-wrong decision making is based in both evolution and culture. Biology dictates that we care more about ourselves and our kin than we do more encompassing groups. Reason suggests more noble aspirations such as doing what is best for humankind. Ethics is about justification that is acceptable by others, there is no sound proof of any possible base for universal moral values. At best we can maximize preferences for as large a group as possible from a somewhat impartial standpoint, but even this may be an impossible ideal.
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