Moral circle expansion is the attempt to expand the perceived boundaries of the category of moral patients. It has been proposed as a priority cause area and as a heuristic for discovering cause X.
Aird, Michael (2020) Collection of sources relevant to moral circles, moral boundaries, or their expansion, Effective Altruism Forum, May 7.
Many additional resources on this topic or related topics.
Anthis, Jacy Reese (2018) Why I prioritize moral circle expansion over artificial intelligence alignment, Effective Altruism Forum, February 20.
Karnofsky, Holden (2017) Radical empathy, Open Philanthropy, February 16.
Laham, Simon M. (2009) Expanding the moral circle: inclusion and exclusion mindsets and the circle of moral regard, Journal of Experimental Social Psychology, vol. 45, pp. 250–253.
Singer, Peter (1981) The Expanding Circle: Ethics and Sociobiology, New York: Farrar, Straus and Giroux.
Slinsky, Grue (2019) The moral circle is not a circle, Effective Altruism Forum, August 14.
Anthis, Jacy Reese & Eze Paez (2021) Moral circle expansion: A promising strategy to impact the far future, Futures, vol. 130, 104743.
Vaughan, Kerry (2016) Three heuristics for finding cause X, Effective Altruism, November 4.