authors:
- Singer, Peter
date: '2016-07-13'
edition:
  published: '2011'
  publisher: Princeton University Press
goodreads: '11417583'
isbn: '9780691150697'
language: en
lastmod: '2016-07-13'
path: /library/singer-1981.html
published: '1981'
reference: Singer 1981
subjects:
- human-evolution
- morality
- political-philosophy
title: 'The Expanding Circle: Ethics, Evolution, and Moral Progress'
type: book
year: 1981