The Importance of Moral Uncertainty

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In theory a device could be built that could scan someone's brain and measure how much utility they're experiencing. Some people argue that you should be morally uncertain in other words you should assign probabilities to different moral theories. I don't really reject those arguments but it's less clear is what kind of balance of the uncertainty plus plus the degree of confidence I have in my own utilitarianism what that would lead me to do that's different from what I'm doing now.

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How have animal rights and the animal rights movement changed in the last few decades? How has the scale of animal product consumption grown relative to human population growth? On what principles ought animal ethics to be grounded? What features of human psychology enable humans to empathize with and dislike animal suffering and yet also eat animal products regularly? How does the agribusiness industry convince people to make choices that go against their own values? What are some simple changes people can make to their diets if they're not ready yet to go completely vegetarian or vegan but still want to be less responsible for animal suffering? What attitudes should vegetarians and vegans hold towards meat-eaters? When, if ever, is it possible to have done "enough", morally speaking? What are the things that matter intrinsically to humans and other sentient beings? What is the most complex organism that is apparently not conscious? Will we ever have the technology to scan someone's brain and measure how much pleasure or suffering they're experiencing? How uncertain should we be about moral uncertainty? What should we eat if it's eventually discovered that plants can suffer?

Peter Singer is a philosopher and the Ira W. DeCamp Professor of Bioethics in the University Center for Human Values at Princeton University. His work focuses on the ethics of human treatment of animals; he is often credited with starting the modern animal rights movement; and his writings have significantly influenced the development of the Effective Altruism movement. In 1971, Peter co-founded the Australian Federation of Animal Societies, now called Animals Australia, the country's largest and most effective animal organization; and in 2013, he founded The Life You Can Save, an organization named after his 2009 book, which aims to spread his ideas about why we should be doing much more to improve the lives of people living in extreme poverty and how we can best do this. In 2021, he received the Berggruen Prize for Philosophy and Culture for his "widely influential and intellectually rigorous work in reinvigorating utilitarianism as part of academic philosophy and as a force for change in the world". He has written, co-authored, edited, or co-edited more than 50 books, including Animal Liberation, The Life You Can Save, Practical Ethics, The Expanding Circle, Rethinking Life and Death, One World, The Ethics of What We Eat (with Jim Mason), and The Point of View of the Universe (with Katarzyna de Lazari-Radek); and his writings have been translated into more than 25 languages. Find out more about him at his website, petersinger.info, or follow him on Facebook, Twitter, or Instagram.