351 | Peter Singer on Maximizing Good for All Sentient Creatures

Summary

Podcast Summary: Mindscape #351

Peter Singer on Maximizing Good for All Sentient Creatures
Host: Sean Carroll
Guest: Peter Singer
Release Date: April 20, 2026

---

Episode Overview

In this wide-ranging episode, Sean Carroll welcomes influential philosopher and activist Peter Singer to discuss utilitarian ethics, moral objectivity, effective altruism, animal rights, and end-of-life issues. Singer, most famous for his defense and development of utilitarianism, explores how philosophical reasoning can help us lead more ethical lives—not just in theory, but in real-world action. The conversation is candid, practical, and deeply moral, offering both philosophical rigor and actionable guidance for listeners who are curious about what it means to maximize the good for all sentient beings.

---

Key Discussion Points & Insights

1. Objective Morality and the Role of Reason ([01:11]–[10:12])

• Is morality objective or subjective?

  • Singer recounts his shift from non-cognitivism (morality as expressions of feeling) toward moral objectivity, inspired by the work of Henry Sidgwick.
  • He stresses that while some moral intuitions may originate from evolutionary adaptations, "reason has something to say about ethics" ([05:21], Singer).
  • Quote:
    "I think that reason has something to say about ethics, and that's where the objectivity or reality comes in." (Singer, [05:21])

• Moral objectivity vs. realism

  • Carroll clarifies the distinction between believing in "moral facts" (realism) versus objective standards independent of personal preference ([07:44]–[08:44]).

2. The Foundation and Scope of Utilitarianism ([10:12]–[19:42])

• Impartiality and 'Point of View of the Universe'

  • Singer discusses Sidgwick's "point of view of the universe," advocating equal moral consideration for all conscious beings ([10:12]–[11:34]).
  • He acknowledges varying degrees of moral standing, depending on cognitive and experiential capacities, e.g., humans vs. some animals.

• Consequentialism vs. Deontology vs. Virtue Ethics

  • Singer identifies himself as a "dyed in the wool consequentialist" and explains that utilitarianism is a specific type that considers the well-being of sentient beings as the only intrinsic good ([12:03]–[14:56]).
  • Quote:
    "A consequentialist, somebody who thinks that the right actions are those that have the best consequences." (Singer, [12:03])

• Hedonistic Utilitarianism

  • Singer discusses his evolution from "preference utilitarianism" to "classic hedonist utilitarianism," emphasizing happiness and suffering as the key value metrics ([16:15]–[19:42]).

3. The Measurement and Puzzles of Utility ([19:42]–[27:01])

• Is utility real or measurable?

  • Singer contends that while we can't precisely measure utility, humans make comparative welfare judgments in daily life (e.g., choosing restaurants) ([20:16]–[21:48]).

• Classic objections and 'biting the bullet'

  • Carroll raises common counterexamples (e.g., sacrificing the happiness of one for the slight happiness of many). Singer responds by accepting that, in principle, utility may demand such tradeoffs—though the scale of suffering and happiness must be carefully weighed ([22:33]–[24:37]).
  • Quote:
    "We have to be careful with these things about making one person miserable, because maybe if we make them really miserable, that's going to outweigh a very large amount of mild enjoyments..." (Singer, [23:25])

• Additivity and Population Ethics

  • The podcast touches on technical debates—whether utility "adds up" linearly, and population ethics puzzles like Derek Parfit's "Repugnant Conclusion" ([25:13]–[26:43]).

4. Trusting Intuitions vs. Philosophical Logic ([27:01]–[32:59])

• 'Biting the bullet' and revising intuitions

  • Singer is renowned for accepting sometimes counterintuitive results if required by reasoned principles, seeing many moral intuitions as products of unreliable cultural or evolutionary history ([27:01]–[31:11]).
  • Memorable Example:
    Singer discusses Jonathan Haidt’s incest scenario—people have a "deep instinct" but cannot offer a reason, revealing the limits of intuition ([28:40]).

• Reflective Equilibrium vs. Foundationalism

  • Singer criticizes John Rawls’s reflective equilibrium, preferring to establish solid theoretical foundations and adjust intuitions to them rather than iteratively adjusting theory and intuition ([31:11]–[32:59]).

5. Impartiality in Practice ([32:59]–[36:15])

• Should we care equally for all?

  • While, in principle, everyone’s welfare counts equally, Singer concedes practical necessity for partiality toward loved ones ([33:39]–[34:59]).
  • This balance reflects our human nature without undermining the moral logic.

• Positive case for caring about strangers

  • Singer argues that if suffering is intrinsically bad, distance is irrelevant:
    "If we don't, if we say, for example, well, they're far away and I'm only going to care about those who are close to me, we are using a distinction that may have some practical value ... but it's less so now..." ([36:15], Singer)

6. Utilitarianism, Paternalism, and Real-World Ethics ([37:44]–[44:31])

• Should we intervene for others' good?

  • Carroll asks if utilitarianism justifies intervention in others' lives; Singer acknowledges paternalism can be justified if it increases overall well-being (e.g., seatbelt laws) ([37:44]–[40:08]).
  • "Saying I have a right is not the end of the discussion." (Singer, [42:11])

• Utilitarianism and global poverty

  • Singer presents his most famous real-world argument: that giving to people in extreme poverty (living on <$3/day) provides far greater utility than spending on marginal luxury ([45:01]–[48:41]).
  • He lists practical ways marginal income can dramatically improve lives (health, education, food, shelter).

7. Charity, Government, and Corporate Responsibility ([48:41]–[55:18])

• Who should fight poverty: individuals, companies, or governments?

  • Governments are ideally situated due to progressive taxation, but political constraints mean progress relies heavily on individuals and (increasingly) corporations ([49:13]–[53:42]).
  • Singer highlights his involvement with organizations like The Life You Can Save and Profit for Good, advocating for more systematic philanthropy and corporate giving ([51:55], [53:42]).

• Effective Altruism's Growing Pains

  • The movement’s focus has shifted from direct aid to risk mitigation (preventing existential catastrophes via AI safety, etc.), which Singer views with mixed feelings:
    • He values immediate good (poverty, animal welfare) as more reliably impactful.
    • He recognizes the argument for prioritizing extinction risk (vast future generations), but remains cautious about speculation ([55:18]–[59:07]).

8. Realistic Ethical Expectations ([59:07]–[62:23])

• How much should we give?
  • Singer distinguishes between ideal and realistic ethical asks—taxing people to their breaking point achieves less in practice than encouraging achievable, progressive giving ([59:33]–[61:44]).
  • "[A]sking people to give is itself an action, and utilitarians will weigh those actions in terms of their consequences." (Singer, [62:06])

9. Animal Rights and Animal Liberation ([62:23]–[72:41])

• Sentience as moral consideration

  • Singer notes research influencing animal welfare law (e.g., UK recognition of the sentience of cephalopods), citing its rare immediate impact ([62:52]–[64:33]).

• Factory farming as a moral atrocity

  • Singer details the immense scale and suffering of factory farming—"one of the great moral atrocities"—and debunks misconceptions about improvements in animal welfare, especially regarding the U.S. versus Europe ([64:54]–[70:25]).
  • Quote:
    "I think that factory farming is really one of the great moral atrocities that's going on right now." (Singer, [65:01])

• Consumer impact and labeling

  • Practical advice for buying eggs; highlights misleading labels such as "cage free" vs. "free range" ([71:33]–[72:41]).

10. End-of-Life Ethics ([72:41]–[75:98])

• Assisted dying and pointless suffering
  • Singer's advocacy for end-of-life decisions follows from his core position: pointless suffering (poverty, animal abuse, unwanted prolonged dying) should be minimized ([73:10]).
  • He supports rational autonomy in end-of-life decisions but favors safeguards against impulsive choices ([75:16]).

11. Singer's New Podcast: Lives Well Lived ([75:58]–[79:15])

• About the podcast

  • Singer describes his new show with co-author Kasia de Lazari-Radek, interviewing guests from all walks of life about living well, including activists, artists, and thinkers ([76:24]–[79:15]).
  • Notable guests: Daniel Kahneman, Paul Simon, Judy Collins, Yuval Noah Harari, and activist Kakenya Nataya.

• Name of the podcast:
  "It's called Lives Well Lived." ([79:03], Singer)

---

Memorable Quotes

• "Reason has something to say about ethics, and that's where the objectivity or reality comes in."
  (Peter Singer, [05:21])

• "A consequentialist ... thinks that the right actions are those that have the best consequences."
  (Peter Singer, [12:03])

• "If we were all saints, then yes, we would give away down to that level of marginal utility ... but we’re not."
  (Peter Singer, [59:33])

• "I think that factory farming is really one of the great moral atrocities..."
  (Peter Singer, [65:01])

• "Saying I have a right is not the end of the discussion."
  (Peter Singer, [42:11])

---

Notable Moments & Timestamps

• Singer’s Journey to Objectivity: [05:21]
• Consequentialism vs. Other Moral Theories: [12:03]
• Singer’s Shift to Hedonistic Utilitarianism: [16:15]
• Addressing the measurement problem in utility: [20:16]
• Factory farming scale and moral challenge: [65:01]
• Global poverty: scale and solutions: [45:01], [49:13]
• Effective altruism and its current critiques: [54:34]
• End-of-life ethics unified by reducing suffering: [73:10]
• Introducing his podcast Lives Well Lived: [76:24], [79:03]

---

Conclusion

This episode is essential listening (or reading) for anyone interested in the "how" and "why" of ethical living. Singer's approach is as rigorous as it is compassionate—he pushes listeners to broaden their circle of concern, rethink ingrained intuitions, and act effectively for the welfare not just of people close to us, but all sentient creatures. Whether the topic is poverty, animal suffering, or autonomy at life’s end, Singer offers both challenging argument and practical solutions.

Podcast recommendation:
"Lives Well Lived" — Peter Singer’s new show (available wherever you get your podcasts, including Mindscape).

---

Transcript

[T-Mobile Advertiser]

Everyone deserves to be connected. T Mobile and US Cellular are joining forces. Our networks are coming together bringing more T Mobile coverage all over the country.

Switch to T Mobile and save up to 20% versus Verizon by getting built in benefits they leave out. Check the math@t mobile.com Switch and now

T Mobile is available in a US cellular store near you bigger network.

The combination of T Mobile and US Cellular's network footprints will enhance the T Mobile network's coverage savings versus comparable Verizon plans plus the costs of options, benefits, plan features and taxes and fees vary. Savings with three plus lines include third free line free via monthly bill credits Credit stop if you cancel any lines. Qualifying credit required.

[Libsyn Ads Representative]

Marketing is hard, but I'll tell you a little secret. It doesn't have to be. Let me point something out. You're listening to a podcast right now and it's great. You love the host. You seek it out and download it. You listen to it while driving, working out, cooking, even going to the bathroom. Podcasts are a pretty close companion. And this is a podcast ad. Did I get your attention? You can reach great listeners like yourself with podcast advertising from Libsyn Ads. Choose from hundreds of top podcasts offering host endorsements, or run a pre produced ad like this one across thousands of shows. To reach your target audience in their favorite podcasts with Libsyn Ads, go to Libsyn ads.com that's L I B S Y N ads.com today.

[Sean Carroll]

Hello everyone and welcome to the Mindscape podcast. I'm your host, Sean Carroll. We all in life struggle with the question of what is the right thing to do? How do you behave like a good person? What is the moral thing to do, the ethical thing to do? Once you get into the professional philosophy sphere, you start asking what do you mean by the right thing to do? Is there something called the right thing to do? Is that an objective truth about the universe? Do people just make it up? And if it's out there, whether we make it up or not, how do we find it? How do we calculate? How do we decide what is the right thing to do under various conditions? Probably. Although there are many different approaches, the most popular current approach is utilitarianism. Some version of saying that there's some quantity, the utility, the greatest good, the total happiness or pleasure or well being of conscious creatures, human beings, however you want to slice it, that we should try to maximize. The more people are happy, the more their well being is fulfilled, et cetera. The better off, the more moral we're going to Be. And probably the most prominent proponent of utilitarianism in modern philosophy is today's guest, Peter Singer. Peter Singer has been a very active voice in both developing utilitarian philosophy, but also in implementing it. He has had an impact on the real world more than most philosophers have had. He's both been very, very careful in thinking about what it means to increase the total happiness of humanity. And he's famously willing to follow the implications of his reasoning wherever they may lead. He believes that we all have moral intuitions or feelings. Some of them are not right. And so sometimes, if you're careful about doing moral philosophy, you're going to be led to conclusions that are a little bit surprising or counterintuitive at first. But if you trust your logic, you should nevertheless accept them. Among the areas in which he's had influence on are effective altruism, the idea that we shouldn't just be philanthropic and give money to good causes, but we should sort of target our giving to the most impactful causes. Also animal rights and fights against factory farming. He wrote a very influential early book called Animal Liberation, which basically makes the argument that if animals have feelings, if they have preferences or happiness or well being, then they should count for how we should increase the, the total happiness of conscious creatures here on Earth. He continues to be super active in both philosophizing and fighting for these causes, especially against poverty worldwide. And nowadays he has expanded his efforts into podcasting. He and Kasia de Lazari Radek have started a podcast called Lives well Lived. And so he has a wonderful microphone set up, which makes him a great podcast guest. Right. So we're very happy to have Peter Singer on today's podcast to think about all these questions. How to be a good person, why this approach is better than the others, and what it means for the real world. So let's go. Peter Singer, welcome to the Mindscape podcast.

[Peter Singer]

Thank you, Sean. Great to be with you.

[Sean Carroll]

So, obviously a lot of what we're going to talk about falls under the umbrella of ethics. But as you know, being a professional philosopher, there's also meta ethics. There's this issue of, like, how do we even know how to justify a story of how to behave ethically? I mean, what are your general feelings here? We'll start very broad and work in. Do you think that morality is something objective and real? Or are you of the school where we kind of make it up?

[Peter Singer]

I do think that there is something objective and real. Although obviously a lot of our moral intuitions are evolved intuitions that have helped our ancestors to survive. So I don't really trust those moral intuitions. But. But I think that reason has something to say about ethics, and that's where the objectivity or reality comes in. This is not a view that I've always held. I started out as what philosophers call a non cognitivist. So something that basically holds that there's nothing to be known, that there's no knowledge. Initially, the view that I held that was quite popular when I was an undergraduate in the 60s was that moral judgments are expressions of our emotions, our feelings. I moved a little bit more when I got to Oxford and studied with RM Hare, who thought that moral judgments are prescriptions. That's like commands, but also that they are governed by, when you think ethically, by the need to make those prescriptions universalizable. That is essentially, that's something like the golden rule. So it's something like, well, if you say that this is the right moral thing to do, and perhaps on this occasion you benefit from it, you're telling somebody not to harm you, but if you're actually in the reverse of the roles, so you also have to stick to the same moral judgment. Your moral judgments can't just say, well, because I'm Peter Singer, I can do this to you, but because you're Sean Carroll, you can't do that to me. So that brought in an element of reason. But for Hare, it was kind of something just part of the grammar of the moral language. And that wasn't really enough for me. So after struggling with that for a few years, I came to a view that I took from the late 19th century philosopher Henry Sidgwick. Really that there are rational judgments, that we are capable of looking at things from a broader point of view than our own. He called it the point of view of the universe, although he wasn't saying that the universe is a being with a point of view and that produces an element of reasoning. I think objectivity in moral judgments, I

[Sean Carroll]

guess there is a distinction, maybe we should be careful about, between moral realism and moral objectivity.

[Peter Singer]

Right.

[Sean Carroll]

Like moral realism gives us the impression that there's something out there, some morality stuff that we can experiment on or something like that. Whereas objectivity just means it's independent of our personal subjective point of view.

[Peter Singer]

Yes, I think that's right. The term moral realism suggests that in some way this is like part of the furniture of the universe, that we could discover it in some way as we can discover other galaxies. And clearly that's not the case. But I think that it's objective in the sense that any being capable of reasoning could understand the reasons that we give for acting in the ways that we say the way you ought to act. So that's what makes it larger than just ourselves or even our species.

[Sean Carroll]

So what do you say to people who just say they disagree with you? Like maybe I do think that the morally right thing to do is whatever Sean Carol wants and there's nothing you can say about it.

[Peter Singer]

I do think that if you say that you're denying the fact that others are like you, that I'm like you, and that you are justified in ignoring that fact, so you're missing some fact about the situation or you're not giving it attention or weight. And if we are going to talk ethically, I think that's not justifiable. So what I'm saying is, you know, yes, there's a selfish way of reasoning that you can engage in, but you are just looking at it from that perspective. And that's a narrower perspective, one that, you know, again, maybe we, our ancestors evolved and survived because they took that perspective. But we can look at things from a broader perspective, this point of view of the universe, and say, well, is it a bad thing that somebody is suffering? And I think when we do that and we understand what suffering is, then we can say, yes, that is a bad thing. And that's something that you're ignoring when you only look at Sean Carroll suffering and not at the suffering of others that you're causing.

[Sean Carroll]

So I think it sounds like, and this will come up later, a crucially important role is being played here by a kind of equivalence that different agents have. Right? There's no higher moral standing that one agent has than another. And sort of given that, I don't want to say assumption, but at least starting point, you can go pretty far.

[Peter Singer]

Yes, there's some sense in which some moral agents may have a higher status. They may be able to suffer more, for example. So there are some non human animals who maybe we may decide that they are also, well, they're certainly agents. We may even say that they're moral agents in some cases, but maybe they have a more limited perspective on the world or limited cognitive capacities and possibly they're not capable of suffering as much or enjoying life as much as. And there's one sense then in which they matter less than we do. So I'm not saying that every moral agent is of equal worth in some deep sense, but I am saying that any being capable of having conscious experience matters and ought not to be ignored.

[Sean Carroll]

That's very helpful, thank you. I know what your answer to this is, but could you maybe explain to the audience there is a traditional division of approaches to ethics into consequentialists, point of view, deontology, where you care about the rules that you're given, and maybe virtue ethics, where you're trying to be virtuous as a process in life rather than following a set of rules. Which one of these are you?

[Peter Singer]

Okay, well, I'm a consequentialist, Right? You guessed. Yes. Not a secret. I have been for my entire career. A consequentialist, somebody who thinks that the right actions are those that have the best consequences. Whereas a deontologist essentially denies that, says sometimes an action is right even though it will have all things considered and for everybody affected worse consequences than some other action. And a virtue ethicist, I think actually virtue ethics is compatible in some form with consequentialism, perhaps also with deontology, because virtue ethics simply says you should be the kind of being who has a character of virtue that is virtuous. And then of course, we have to define what virtuous means, and that's fairly open. But a consequentialist will say, well, the virtues one should have are those that in the long run will tend to produce the best consequences. Yeah, so I do find virtue ethics.

[Sean Carroll]

Sorry, go ahead.

[Peter Singer]

I was just gonna say I don't really see that as a completely independent moral view.

[Sean Carroll]

I do think the virtue ethics is sort of frustratingly vague. And yet I do find myself growing in sympathy toward it over time. So I'm glad that I can talk to a dyed in the wool consequentialist, which is what I used to be, but I'm sort of backsliding a little bit. So utilitarianism is a particular way of being consequentialist.

[Peter Singer]

That's right. You can think of consequentialism as the genus and utilitarianism as the species. So consequentialists might value a wide range of things. They might say, for example, that freedom or autonomy or knowledge or justice are independent goods, that they are things of intrinsic value even if they don't produce more happiness and less suffering for sentient beings. Whereas utilitarians say, no, the only thing that is really of intrinsic value is the well being of sentient beings. Conscious, desirable, conscious states, if you want to put it that way. And all of these other things are very important. You know, deny that they're important, but they're important instrumentally as A means to producing in the long run a society that does lead to more happiness for for all sentient beings. So that's the difference between non utilitarian consequentialists of whom there are some who think that there are these other independent goods and utilitarians like myself.

[T-Mobile Advertiser]

Everyone deserves to be connected. T Mobile and US Cellular are joining forces. Our networks are coming together bringing more T Mobile coverage all over the country.

Switch to T Mobile and save up to 20% versus Verizon by getting built in benefits they leave out. Check the math@t mobile.com switch and now

T mobile is available in a US cell cellular store near you bigger network.

The combination of T Mobiles and US Cellular's network footprints will enhance the T Mobile network's coverage savings versus comparable Verizon plans plus the costs of options, benefits, plan features and taxes and fees vary. Savings with three plus lines include third free line free via monthly bill credits credit stop if you cancel in lines. Qualifying credit required.

[Jerry Insurance Advertiser]

Are you noticing your car insurance rate creep up? Even without tickets or claims, you're not alone. That's why there's Jerry, your proactive insurance assistant. Jerry handles the legwork by comparing quotes side by side from over 50 top insurers. So so you can confidently hit buy. No spam calls, no hidden fees. Jerry even tracks rates and alerts you when it's best to shop. Drivers who save with Jerry could save over $1,300 a year. Don't settle for higher rates. Download the Jerry app or visit Jerry AI Libsyn. Today that's J, E R R Y AI Libsyn.

[Sean Carroll]

And of course among utilitarians there are subspecies and factions. Do you have a specific brand that you appeal to?

[Peter Singer]

Yes. I'm now a classic hedonist, hedonistic, utilitarian. That means I regard happiness and pleasure again, desirable states of consciousness. We call them the kinds of states of consciousness that you like to have for their own sake. I regard them as good and undesirable states, obviously. Pain, misery, suffering as bad the again, for some years I was a preference utilitarian.

[Sean Carroll]

That's what I thought, so this is news to me. Yeah, thanks.

[Peter Singer]

Right?

[Sean Carroll]

Yeah.

[Peter Singer]

Yeah. Okay. So I was a preference utilitarian again somewhat under the influence of. Of RM Hare because Hare's view was, as I said before, that moral judgments universe have to be universalizable. And that means we have to put ourselves in the position of others. And when we put ourselves in the position of others, Hare said we take on their preferences. So we take on what it is that they want and how much they want it. And that's what we should be maximizing, giving, satisfying their preferences. But of course, there's a problem with that. And that problem is that they may be misinformed about a whole lot of things in their preferences, and they may want something and not realize that it's actually not going to be nearly as good as they imagined it was, might in fact be quite bad. So Hare then adjusted that to say, well, it's the preferences that you would have if you were fully informed. And also if you were thinking calmly, for example, and not, you know, like you might have a preference in a rage, somebody has insulted you and you want to strike them in the face. And that will have terrible consequences if you do that. But, you know, because you're in a rage, that's your preference. And again, Hare said, well, you have to be. Have to be what you would want if you thought calmly and rationally about this. And actually, Sidgwi kind of anticipated all of this in the 19th century and pointed out that if you're talking about the preferences you would have if you were rational, then you have to think, well, is there some reason for thinking that happiness is good and that some other preferences are not good? And Sidgwick argued that there are reasons for thinking that happiness is good and that other things that people might prefer, even intrinsically, are actually not good, not good in themselves. So, you know, that was one reason why I then shifted to a hedonistic viewpoint. And another was, I suppose that I moved away from that universal prescriptivism, as I said before, to the idea of a more objective ethic. So I made that change in roughly in the early teens of this century. And the most definitive statement of it is a book that I co authored with the Polish philosopher Katazina Dillazar Iradic called the Point of View of the Universe. Again, that's that phrase from Sidgwick. And it is really kind of a discuss an account of Sidgwick's views and a defense of Sidgwick's views in the context of contemporary philosophy.

[Sean Carroll]

One of the things that I always worried about with utilitarianism was the apparent need to say that there was this thing called utility, that whether or not I could accurately measure it, it existed, and I could somehow add up the utility of caused by someone being happy and compare it to the utility from someone else being happy or sad or whatever. And that seemed like wishful thinking and not really reflective of true human experience. Am I right to think that that's what a utilitarian has to believe.

[Peter Singer]

A utilitarian doesn't have to believe that we actually can measure it. But it exists in a precise way. But it exists. Yes, that's right. A utilitarian would have to believe that there is some state of happiness that you're in that I cannot directly access or measure. And, you know, that it might be greater or lesser than mine, but I think that's something that we all have to do anyway. I'm a little puzzled by this objection. You know, suppose that you and two, you know, you and a few other people are going out for dinner, and you say, well, which restaurant should we go to? And you say, I really love Chinese food, especially that spicy Szechuan food. Let's go to that. And two other people say, yeah, I enjoy Sichuan. And then someone else says, I'm sorry, I really hate spicy food. I just can't take it. So you have to decide now, are you going. Is your preference and that of the others who enjoyed that Szechuan food gonna outweigh that of the other person who will, you know, have to order the plain boiled rice and maybe some vegetables with not much flavor in them if they go along? Right. And we do that kind of thing all the time in deciding those kinds of group choices. So I don't think the utilitarian has to say more than, well, yeah, we try to do that as accurately as we can. Maybe we're getting some techniques for assessing it a little bit better than we used to, but. But that's the situation we're in.

[Sean Carroll]

I mean, I do think I hear that response very clearly. I would say that human beings act as if something is real and true all the time without it being real and true. Oh, that is true. It's not really a definitive. And it gets us into sort of the classic worries about utilitarianism. I apologize. I'm sure that you've had these conversations many times over the decades. But if you're a straightforward utilitarian, there's all sorts of puzzles you run into of the form, would it be okay to make one person much, much, much less happy if we could just make a lot of people a little bit happier and the totals outweighed?

[Peter Singer]

Yes, you're right. There are many such objections put to utilitarianism. I tend to think that the answer to those objections is if you specify that this is a hypothetical example, and we know that the slight happiness of the many is going to outweigh the greater unhappiness of the few or the one, and we know there are no further bad consequences from this, then that could well be the thing that we ought to do. Now, let me just add that we need, in order to decide that that slighter happiness of the many outweighs the greater happiness of the one, we need to have a scale on which we compare suffering or unhappiness with happiness. And it's not obvious that that scale is one that runs in equal, you know, thinking of it spatially, runs an equal distance from the neutral point in both directions. In other words, I sometimes asked my audiences this question. Suppose that a fairy says, I can grant you an hour of the greatest pleasure that you have ever experienced, but the price you have to pay for that is that you will also have an hour of the greatest pain that you have ever experienced. Would you like me to grant you that wish? And most of the audience says no. And I conclude from the fact that most of the audience says no, that we think that the worst pains we suffer actually are further from the neutral point than the greatest pleasures that we suffer. Sorry, the greatest pleasures that we enjoy. So we have to be careful with these things about making one person miserable, because maybe if we make them really miserable, that's going to outweigh a very large amount of mild enjoyments that the many are going to experience.

[Sean Carroll]

I'll confess I haven't read a lot of the technical literature on utilitarianism, but knowing philosophers, as we both do, I'm sure that someone has tried to make this fearsomely mathematical. I mean, I'm wondering, is it necessarily the case that if there's a certain amount of utility garnered by increasing two people's happiness by a certain amount, does utilitarianism have to assume that you get twice as much utility if four people get that increase in happiness? Is there some linearity or addition kind of assumption being made?

[Peter Singer]

Yes, I think that is the standard view. There are some people who've toyed with the idea of, if you like, a sort of declining marginal utility of utility itself. And they do this particularly on the puzzles about population ethics. So you're perhaps familiar with the examples that we owe mostly to Derek Parfit about the idea that for any world which has, let's say, 1 billion people who are extremely happy having wonderful lives, you could imagine a world of much larger world in which everybody is just barely above the level at which life is worth living. Derek Parfit called it a life of Muzak and potatoes. So you only get to eat potatoes. They're okay, but you know, you don't love them and you only listen to no Mozart, only music, the stuff that comes out of the elevators at you. So some people have said, well, if you have very large populations, then the value of the additional utility falls away in some way. But it's not entirely clear why it falls away or what the discount rate is for that. So I think it's better just to say, yes, if happiness is good and the happiness of two people is good, then the happiness of four people, the same level of happiness, is twice as good.

[Sean Carroll]

So one of the things that you're famous for is to oversimplify, biting the bullet like you really are, I get the impression, very willing to accept somewhat counterintuitive conclusions that arise out of your moral precepts, such as they are. Would you say that's accurate?

[Peter Singer]

Yes, that's accurate. And the underlying reason for that is that, as I briefly mentioned earlier, I think our intuitions have arisen in various ways that suggest that they are not likely to be tracking moral truth or the best impartial, objective views, because so our intuitions arise from various sources. Some of them, of course, are cultural. That may be that we were brought up in a certain ethic. That ethic may have been influenced by the religion that was dominant in our society or in our group. And that is not a trustworthy source, in my view. I'm an atheist, so I don't think any religious teachings have any authority as such. Some of them might be wise and some of them might not be wise. And very often they have solidified centuries ago in circumstances that are quite different from our own. So I don't think they're something to be relied upon. And then some people say, oh, but there are these more or less universal judgments that everybody has. For example, that incest is wrong. And then you say, well, yes, but that may be an evolved intuition, and that's why it's universal, because incestuous relationships might lead to inferior children. And so maybe those groups that practiced incestuous relationships and reproduction didn't survive. And so the ones that had an inhibition against that did better. So that also is not, at least today, a reason against incest, because we have reliable contraception, and if that fails, we have abortion. So, you know, Jonathan Haidt has an example where he talks about a case of adult sibling incest. So an adult brother and sister who are alone on a holiday somewhere in a remote place decide it would be fun to have sex. They have sex, they enjoy it, but they say, yeah, okay, but we don't need to do that again. We've had that experience. And they remain close as a sibling, as siblings. Was there something wrong with that? And when Haidt, who was a psychologist rather than a philosopher, asked his students and experimental subjects, they nearly all said, oh, yes, that's, that's wrong. And then heit would say, well, why is it wrong? And they would say things, oh, like, because they might have children who are abnormal. But actually, I didn't spell this out. But in the example they used, although, although the woman was on the pill, the sister was on the pill, but the brother decided to use a condom as well, so there was really no chance that they were going to have an offspring. And then you might say, well, it could hurt their sibling relationship, but they were told in the example that it didn't. So, you know, it's. They can't really explain, but they just have this deep instinct that incest is wrong. Okay, well, we can explain why they have that incest. Sorry. We can explain why they have that instinct, that intuition. But it doesn't give us any reasons for thinking that what this couple did was wrong.

[Sean Carroll]

I guess this is a classic kind of tension that arises in moral philosophy. You try to be systematic about what your starting point is, whether you want to call them moral axioms or your ethical theory or whatever, and then you reach some conclusions. But your axioms, your starting points are certainly somehow informed by, let's say, moral judgments, whether they're intuitions or educated or whatever. And then when we reach conclusions, if we reach a conclusion that is at odds with our existing moral judgments, maybe, like you just said very nicely, maybe it's because our existing moral judgments are just not really up to date. Maybe they're not as well thought out as. As we hope that they were, but maybe our starting point wasn't right either. And, and how do you. How do you know? How do you. How do you work with that dialectic?

[Peter Singer]

Right. So, I mean, what you're talking about really sounds like the idea of reflective equilibrium that John Rawls put forward in a theory of justice, that we sort of. We develop a theory or a basic starting point for foundation for moral theories, and then we test the theories against our intuitions, and we either tweak the theory to produce better intuitions, or we tweak the intuitions to match the theory. Rawls originally suggested this was a little bit like a scientist trying to produce a theory to match the data. And if there are a couple of points of data that the theory couldn't match. Well, then you perhaps rejected that data. You said, well, there must have been something wrong with that observation. But by and large the right theory was the one that best matched the data. I think that's a mistaken view of what we're doing in morality because I don't think there is this solid data that there might be in science, scientific observation. So I'm more of a foundationalist than a proponent of reflective equilibrium. I try to get the foundations as clear as I can, try and reflect on them, think about them, take the most rational point of view that you can. And that's as I was saying at the beginning, trying to take the point of view of the universe rather than our own point of view and try to find what is intrinsically good and what is intrinsically bad. And coming up with the idea of desirable states of consciousness as intrinsically good and undesirable states of consciousness, ones that you would rather stop as intrinsically bad. And that seems to me to be a more solid foundation than relying on those moral intuitions.

[Sean Carroll]

Good. This leads us to, I mean, maybe rolling up our sleeves a little bit and digging into some of the details of how you think through your version of utilitarianism. I mean, as I mentioned earlier, the impartiality of who gets the utility seems to be a big part of it. I mean, again, I know a little bit about what you've said, so many of my questions are going to be of the form. I think it's like this, tell me if I'm wrong. So is it fair to say that every person should give equal care to the well being of every other person, no matter how near or far they are?

[Peter Singer]

That's a kind of simplified overall perspective. But it's not that everybody should do that in their daily life all the time. I simply don't think that would work. Again, we have evolved as beings who love and care for their children and have close relationships with other kin as well. Siblings, parents, maybe even cousins. And of course close ties with friends, unrelated friends with whom we have mutually beneficial relationships, often cooperative relationships. And I don't think we can simply set all that aside and say, well, I'm going to deal with strangers exactly the same way that I deal with my children or with my close closest friends or my partner. We have to show some partiality there. So although in one sense I think the well being of every other sentient being counts as much as the similar well being of myself and those close to me, I think we in practice have to take account of the fact that we will only do well and others will only do well in close personal relationships that necessarily involve some form of partiality.

[T-Mobile Advertiser]

Everyone deserves to be connected. T Mobile and US Cellular are joining forces. Our networks are coming together bringing more T Mobile coverage all over the country.

Switch to T Mobile and save up to 20% versus Verizon by getting built in benefits through they leave out. Check the math@t mobile.com Switch and now

T Mobile is available in a US cellular store near you Bigger network the

combination of T Mobile and US Cellular's network footprints will enhance the T Mobile network's coverage savings versus comparable Verizon plans plus the costs of options, benefits, plan features and taxes and fees vary. Savings with three plus lines include third free line free via monthly bill credits credit stop if you cancel any lines Qualifying credit required when people turn to

[Orderly Meds Advertiser]

telehealth for weight loss, they're looking for real support. That's why more people are choosing orderlymeds.com orderly meds connects you with real doctors and access to proven GLP1 medications like semaglutide and Tirzeptatide. No guessing, just a more supportive experience and all shipped directly to your door in discreet packaging. Do your research, ask questions, then visit orderlymeds.com podcast for an exclusive offer. That's orderlymeds.com podcast. Individual results may vary. Not medical advice, eligibility required. See site for details

[Sean Carroll]

okay, this is, this is fascinating to me. This is clearing things up. I mean, maybe rather than asking it that way, let me give you the opportunity to make the positive case for why we should care about strangers, people far away, things like that.

[Peter Singer]

We should care about strangers and people far away because they are capable of having the mental states that are intrinsically good or the mental states that are intrinsically bad. And it matters. It's a better universe. If most of the people, and I should say sentient beings, not only humans, do not have the really bad states that are intrinsically bad, like states of agony. And it's good if they have the positive states of happiness, well being, fulfillment. So that's why we should care about them. If we don't, if we say, for example, well, they're far away and I'm only going to care about those who are close to me, we are using a distinction that may have some practical value. People often say, well, I know better what they want and I can help them better. And that again used to be the case very clearly before we really could know what was happening to people on the other side of the world. But it's less so now, though it's not entirely disappeared that we know better what people want when they're close to us. But we would be invoking this difference of distance when it's not really relevant to what is intrinsically good and bad, which are the states of consciousness that sentient beings can have.

[Sean Carroll]

I probably should have asked this earlier, but your discussion just reminded me of this question as a utilitarian. How much should we intervene in people's lives for their own good if we think that they're on a self destructive path? Does being a good utilitarian sort of give us a license to set them straight?

[Peter Singer]

Yes, it does. If that's going to be positive in its consequences. If they're just going to get angry with us and completely, let's say it'll end the friendship that we have and they're not going to listen to us at all, then obviously that's not a good thing to do. And there is this idea of somebody being a busybody and interfering in other people's business and often people do that wrongly and don't really know what's good for another person. John Stuart Mill, a famous utilitarian, said something like that everybody is the best judge and guardian of their own interests. I don't actually think that that's right. And Mill would have opposed some of the laws that we now take for granted, like laws that require people to wear seat belts when they're in cars. So I think that you can go too far in interfering with people. But some forms of intervention are clearly justified, as in the seatbelts example, which tends to be done by legislation. But if you were in a car and you noticed that the passenger was not wearing the seatbelt, nowadays of course you would just say, look, there's this annoying beep going on in the cab. Would you mind putting out your seatbelt? But there were times when cars did not beep if passengers didn't wear seatbelts. But yes, you should certainly have said, please put your seatbelt on. I know the chance of me having an accident is small, but it's worth it.

[Sean Carroll]

The utilitarians have won the car seatbelt design argument pretty strongly, I think. But there is a counter argument, right? I mean, there are those who would say, and maybe this is a fundamental, at least sort of personality type cleavage between deontologists and consequentialists, that there's a certain set of people who would say I have the right to live my life as I would like to. That's what brings Me, happiness, even if I end up getting hurt in a car crash. Therefore, it doesn't matter what the utility is. I'm the custodian of my own being.

[Peter Singer]

So you use the language. I have the right. And that is a language that some people will take as ending the discussion completely because they think that rights are absolute and overriding and inviolable. But consequentialists will be prepared to talk about rights in. In various ways. But. And they may think, you know, yes, we should establish systems of rights, things that people should virtually never do. You know, create a high barrier against anybody violating somebody's rights. Those are important things. But they won't regard that as the end of the discussion. And I would certainly say, you know, yes, you have the right to do. Let's say that I do agree that you have the right to do that. Suppose you're not in my car. Maybe you're riding a motorbike. And you say, I like to have my long hair streaming out behind me in the wind, and I have a right to do that. And I know I'm taking a risk and I might be killed, but it's fine and I'm prepared to do it. Now, you could argue reasonably, plausibly, that, okay, it's better if we let people take responsibility for those kinds of choices that are not going to harm others. If we assume that's not going to harm others, but we can still discuss it with them. We can still say, look, have you been to hospitals where you've seen people who have been riding motorbikes and had brain injuries and they've turned into basically just lying there and making a few noises? And that's. Do you want. Is it really worth it to take the risk of being like that in the end? There are other cases I could give you where I think it's clear that when somebody says I have a right, we might want to object. Suppose somebody is wealthy enough to have bought a great work of art, whatever it might be, a great painting, let's say. And they. Now I say, well, where are you going to hang that? And they say, oh, I'm not going to hang it. Actually, I've decided to cut it into small pieces and use it to wallpaper my bedroom in different places, you know, well, we might say, okay, so you own this. Perhaps you have the right to do it. But, you know, don't you think you're damaging something that millions of people have seen and wanted to see and that, you know, perhaps we'll see again after your period? Of ownership is over, Is that really the best thing to do in the long run? So I think we can. Saying I have a right is not the end of the discussion.

[Sean Carroll]

It does seem we already admitted that human beings are imperfect creatures a little bit. So maybe there's an ideal utilitarianism out there that we can strive for, but we should admit that we fall short. Is there a worry that utilitarianism can act as a license for paternalism, for being a little bit overly interventionist in other people's lives?

[Peter Singer]

The question is where we draw the line of being overly interventionist. Right. Certainly utilitarianism does provide a license for paternalism. And the seat belt example, as you said, is one that utilitarians have won or consequentialists have won that battle. So that suggests that most societies really accept a degree of paternalism. And the question is, what is overly interventionist? And that's a discussion that utilitarians can have. And they may differ from people who are not utilitarians, who place intrinsic value on autonomy. That's true. Or it may be that you can have utilitarian arguments against being too paternalistic. As I said, it may mean that people, you know, just don't take responsibility for their own actions in the right way, and that the state has to become more. More powerful, if you like, more has to become more omnipresent. And that might lead to abuses in the wrong hands. Once this. If the government is not a genuinely paternalistic one, but is seeking its own power. So there's. There might be a variety of risks in being too paternalistic that utilitarians can accept as reasons for restraining paternalism in some circumstances.

[Sean Carroll]

Well, maybe more dramatically, you certainly have suggested that taking this utilitarian perspective seriously, if we're trying to improve the overall utility of the world, one of the most direct things we can do is to fight global poverty. Maybe it's the most direct thing we could do. Talk about how strong that conclusion is. Like how you would actually advise or change people's behavior to make things better by fighting poverty around the world.

[Peter Singer]

Right. Well, one of the ways I would like to change people's behavior is to enable them to see that if they are part of the affluent world and they're not at the very bottom rung of the economic ladder in the affluent world, but they're, let's say, middle class or above, that the additional marginal utility that money has to them is very small compared to the additional marginal utility that money has to somebody who is living in extreme poverty. The World bank defines extreme poverty as something close to US$3 per day now and says there's around 800 million people living on that level, which is actually historically a very low figure. It's about 10% of the world's population. And it's only in the last 20 years or so I think that probably for the first time ever, 10% or fewer of the world's population have been living in extreme poverty. That is, have, have not reliably been able to get enough food for themselves to feed themselves and their family. And we now add other things to being in poverty, like not getting any basic health care. Of course, most of the world didn't get any basic health care for most of our, most of our evolutionary past, not being able to educate our children, all those kinds of things. So if you're living on $3 a day, then obviously if you, let's say you could get an extra thousand dollars, that's roughly your annual income that you've now doubled. And there's all sorts of things that you can do that you couldn't do before. It might be, for example, that you can buy a corrugated iron roof for your dwelling, which up to now has been thatched and leaks when it rains heavily. And anyway is actually more expensive in the long run than a corrugated iron roof because it has to be be replaced quite frequently. But you just could never accumulate the cost of a corrugated iron roof to keep yourself and your family dry. So that could be a big improvement. You could maybe afford to send your children to school when you couldn't previously. You could get some basic health care which might be life saving. You could sleep under malaria nets to prevent your children getting bitten by malarial mosquitoes and small children die from that. So, you know, there's a whole range of important things that you could do that would make a huge difference, would transform your lives perhaps. And what's $1,000 to middle class people in affluent societies? Well, you know, maybe they have a less luxurious holiday than they would have because they're trying to save a little bit of money. It's not a big deal. So I think if people really think about that and think about what it is like to live in extreme poverty and how much better life can be if you can do some of the things that I just mentioned, then more people would be prepared to say, oh, well, that's something good that I can do. I like the idea that I'm transforming other people's lives for the better. And I don't really mind what I'm having to give up to donate that sum. And on the contrary, perhaps I find my life more meaningful and more fulfilling because I know that I am having a positive influence on others.

[Sean Carroll]

So just doing the numbers in my head. If global poverty is roughly 10%, that's roughly a billion people. A little bit less. Actually $1,000 each for a billion people is a trillion dollars, which is a lot of money, but it's not crazy compared to what western countries spend on things. So should we think about this as something that individuals should do by giving to charity or something that is a more society wide obligation and therefore governments should do?

[Peter Singer]

Yeah, and there's an in between alternative which is that companies and businesses might consider doing because this is a very rough estimate. But the profits of companies and businesses worldwide is roughly $10 trillion. And your calculation is pretty good, really. So if companies were to give 10% of their profits, if they were to tithe profits, that could be that trillion dollars. That is going to be enough to bring everybody out of extreme poverty. So there are really those three options, I would say individuals, companies and governments. Now in one way it would be fairest if governments did it because governments have progressive taxation. And that would mean that the wealthiest who could most easily afford to donate significant sums would be doing the most and the poorest would be doing the least. And that would be the right outcome. But unfortunately it's very difficult politically to get governments to do that. And no government is giving really much more than 1%. If I'm not sure, there's maybe one or two that are close to 1% of gross national product. But most of the others, including say the United States is giving very little now. It's giving like a quarter of 1% or maybe a bit less than that. I'm speaking to you from Australia, which is also around that pretty deplorably low level. United Kingdom is a little bit higher and some of the several of the European states are higher, but as I say, none of them really above 1%. So it's. And then there's a further question about is government aid as effectively directed as non government organizations? And there's some evidence that it may not be that it's influenced by political geopolitical sort of policies. Certainly that's been true of US Aid. It's gone to countries that the US had an interest in for many years. Iraq was the number one country for US aid, although it was certainly not the poorest country. So while it would be nice to increase government aid and make it more effective. Those are long shots. Individuals I think relatively easily can give and in a way I direct a lot of my argument towards individuals because I think some of them do respond then. And the effective altruism movement which has been going about 15 years now, has encouraged that and encouraged people to think about giving as effectively as possible. I wrote a book first published in 2009 called the Life youe Can Save, which talked about the most effective organizations that you can give to and develop the arguments that I've just briefly summarised. And the life you Can Save is an organization that encourages people to give effectively and it's distributed so far about $120 million which is significant but not huge to effective organizations. GiveWell is another organization that tries to locate does research on the most effective organizations and it's been supported by what used to be called open philanthropy is now called coefficient giving, which in turn has been supported by Dustin Moskovitz and Carrie Tuner who are sort of digital billionaires. And so that's, you know, some hundreds of millions anyway, perhaps perhaps a billion or so has gone in that way. So I feel that this moral argument actually has had quite a sizable impact, not of the trillion dollar range that you mentioned is needed, but has affected very large numbers of people now for the better. And that's mostly what I've been focusing on. But let me just say one more thing. I have recently got involved with or co founded an organization called Profit for Good which is looking at the company aspect of it and people can go to the website profitforgood.com and see what we're doing. And if any of your listeners are involved with companies that they have some influence over and that might be interested in joining the Profit for Good alliance, we'd be very happy to hear from them.

[T-Mobile Advertiser]

Everyone deserves to be connected. T Mobile and US Cellular are joining forces. Our networks are coming together bringing more T Mobile coverage all over the country.

Switch to T Mobile and save up to 20% versus Verizon by getting built in benefits they leave out. Check the math@t mobile.com Switch and now

T Mobile is available in a US cellular store near you bigger network.

The combination of T Mobiles and US Cellular's network footprints will enhance the T Mobile network's coverage savings versus comparable Verizon plans plus the costs of options, benefits, plan features and taxes and fees vary. Savings with three plus lines include third free line free via monthly bill credits credit stop if you cancel in lines qualifying credit required.

[Jerry Insurance Advertiser]

We all prefer things a certain way like Groceries. If you want groceries just how you like them, you gotta try Instacart. They have a new preference picker that lets you pick how ripe or unripe you want your bananas. Shoppers can see your preferences upfront, helping guide their choices. Because when it comes to groceries, the details matter. Instacart. Get groceries just how you like.

[Sean Carroll]

Do you have any comment on. I mean, I love the idea of effective altruism. You know, if you're going to be altruistic, why not be effective? And we've had people like Will MacAskill and Joshua Green on the podcast who've talked about these things. But the movement, such as it is, has come on a little bit of hard times of late. And one way in which that's happened is that certain effective altruists think that the most effective thing you can do is to give money to them because they're going to save the world from AI or they're going to improve the chances of long term evolution of the species or something. So again, is there a failure mode here that we should be especially alert to?

[Peter Singer]

I think it's a little unfair to say that effective altruists have said give money to them. They might have said give it to think tanks that they're working for. That's possible.

[Sean Carroll]

Not them personally. I didn't mean that short.

[Peter Singer]

Yeah, right. Okay, good. I thought you might be suggesting that they were siphoning off the money. And of course that was suggested about Sam Bankman Fried, which is one of the reasons why effective altruism took a bit of a hit. Because he had been a kind of a pin up boy, the world's richest person under 30. And he had said that he was going to give it away to effective causes. And then it turned out that there was a fraud going on, that he was using trust funds from clients and he's currently sitting in prison. That's very unfortunate in a variety of ways. Obviously the loss of large amounts of money that could have gone to good causes is the greatest tragedy, but it's not representative of the movement as a whole. As I said, there are others, very wealthy people who are giving really effectively. And I think the movement is recovered from that burst of bad media publicity and is still going strong. Yes, there's quite a bit of. Quite a. Quite a number of people in the effective altruism movement are interested in preventing our species becoming extinct, including trying to reduce the risk that AI will take us over in some way. I have mixed feelings about that. I do think that what we've been talking about global poverty is certainly in a more immediate cause that we can with greater certainty know what we're doing and know that we can have good consequences. I also think that animal welfare, and especially trying to combat factory farming of animals which causes suffering on a vast scale is another very practical and immediate concern that we can know we're having good consequences. Whereas trying to reduce the risk of extinction, and especially the risk of extinction being caused by super intelligent AI is much more speculative that you're going to actually succeed. But of course the counter argument goes, well, we're not just talking about 8 billion people when we're talking about reducing the risk of extinction. We're talking about vast numbers of people who will exist and possibly our species will colonize other planets and spread throughout the galaxy or even other galaxies eventually. So, you know, you can talk about not just trillions, but quintillions or whatever of people who might exist and won't exist if in fact we don't survive the next century. So, you know, that's, that's a. I think there's a real point there. I mean, I would value the. Especially, as I've been saying, a utilitarian has to value consciousness, pleasant consciousness, happiness. And if you really think that there's a chance that there will be quintillions of happy beings having solved all the technological problems that we face living in future centuries or millennia, that's something that would be tragic if that were lost. So, you know, it's not obvious that they're wrong to think about extinction risk as a high priority. But yeah, I still think that it's very difficult to know how we are contributing to reducing that particular one. Other extinction risks, by the way, like reducing the risk of bioterrorism or nuclear war, I do take much more seriously as things that we can actually have an impact on.

[Sean Carroll]

I guess one of the worries about being an overly principled utilitarian is it seems to imply that I should basically give away almost all of my wealth, at least until I reach the median wealth of the person in the world. And maybe that's just too much to ask for a typical person. You already alluded to this a little bit, but I mean, what is your response to that?

[Peter Singer]

Yes, so we can distinguish here between what we would do if we were ideal beings purely motivated by the utilitarian idea from what we can reasonably ask of human beings to do, given the way they are and that they have evolved from thousands of generations of beings who survived because they thought about their own interests and those of their close kin. So if we were all saints, then yes, we would give away down to that level of marginal utility by giving more. But we're not. So, and I think what we ought to be asking is what will actually bring about the best consequences? So if we say to somebody, look, you know, if you're going to live an ethical life, you have to give away everything down to the point at which if you gave more, you would be just as poor as the poorest person that you're giving to. And if they then are just going to throw up their hands and say, oh, if that's what ethics requires, I'm giving up ethics because I just can't live like that, then you're not going to get anything. Whereas perhaps if you have a more modest scale of giving, still significant, but more modest, you're going to get a lot more. So that's what I've tried to do. And in the book I mentioned before the life you can save, I draw up a scale of giving which is progressive, like a tax scale. So it starts off with people, modest incomes, giving 1 or 2%. And then by the time you get up to the people who are earning millions each year, it suggests giving a third, which is still, I think, modest enough in that, you know, if you're earning millions every year and you give up a third, you're still very wealthy and probably you probably still have a lot more than you can really spend in a. In a way that adds to your enjoyment. So I think that that's a kind of reasonable scale that we can ask people to give. And in putting it forward, I'm hoping that it will actually maximize the amount that people do give if they think of it in those terms.

[Sean Carroll]

Well, this is very helpful. So it sounds like being a kind of effective real world realistic utilitarian involves a kind of balance between knowing what the ideal utilitarian action would be and knowing a little bit about human nature. Like you say, it doesn't actually raise the total utility of the world if you ask people to do things that they're just not willing to do.

[Peter Singer]

Yes, exactly. And so we have to tailor that. You know, asking people to give is itself an action, and utilitarians will weigh those actions in terms of their consequences. Consequences. So you have to think about trying to put the ask which will have the best consequences.

[Sean Carroll]

I do want to give you a chance to talk about animal rights and animal liberation. You alluded to it a little bit already, but we had Jonathan Birch on the podcast talking about Animal sentience. And I take it that that's part of the argument, if you're impartial about the utility gained by pleasure by different human beings, then almost everyone would agree that animals feel suffering or feel pleasure. And we have to calculate that somehow.

[Peter Singer]

Yes, absolutely. And I think Jonathan Birch is doing exactly that. And the Jeremy Collar center for Animal Sentience at LSE that he's directing is actually remarkably effective. I don't know if you're aware of the story, but it's an unusual example of a philosophical work or joint philosophical and scientific work on the sentience of cephalopods, octopuses and squid and certain group of crustaceans called decapod crustaceans, which is basically lobsters and crabs, having had an immediate legislative effect in, in the uk, because that report came out at the time when the UK was bringing in its new laws to say that animals are sentient beings, which when it was part of the eu, had always been part of EU law, of UK law. But when the UK left the eu, the animal movement protested that this will mean that animals are not sentient beings in the uk. And Boris Johnson said, don't worry, I'll bring in a law to say that they're sentient animals. And that's a promise that Boris Johnson actually kept and he did bring in such a law. And it was just going through Parliament when that report came out and the House of Lords debated it and amended it to. Because it had, because it had been just vertebrate animals, amended it to include cephalopods and decapod crustaceans. So that's a. It's not, it's not. Doesn't mean exactly that they're protected in the same way as other animals, but at least there's something there. It's a legal basis for courts or government policies to give them weight now.

[Sean Carroll]

Well, it's a well known fact when you go to dinner with philosophers, they never eat octopus. And it's usually Peter Godfrey Smith's fault. Your countryman, who's convinced us all that they're smarter than we might think. And I guess that's the argument. But I mean, tell people your thoughts on your own angle is more about factory farming than about the octopuses.

[Peter Singer]

Yes. Although they're not separate, as you might think, because there are moves to factory farm octopuses.

[Sean Carroll]

Oh, I didn't know that.

[Peter Singer]

Yeah, there's, there's, there's a proposal in, in the Canary Islands, which is part of Spain, for a large sort of underwater factory farm for producing. I don't know, millions of octopuses. And I think there are other proposals around. So yeah, don't assume that your octopuses had a happy life living freely in the sea until, until it was caught. You know, if you do eat octopus, and I agree we shouldn't, I think that factory farming is really one of the great moral atrocities that's going on right now. And the reason I think that is the scale is so mind bogglingly enormous. If we're talking about land based factory farms, it's probably something like 70 to 80 billion animals a year. If we're talking about, if we're including factory farms for vertebrate marine animals. So for fish, basically it probably goes up to something like 200 billion animals a year. And if you were to include shrimp and other animals, you're getting into the trillions, but there's less certainty about whether they can suffer. So let's leave them out of it if you like. But just talking about 200 billion vertebrate animals crowded together in conditions that are solely directed to producing their flesh or their eggs or their milk in the cheapest possible manner, with no independent concern for their welfare. And often those conditions thwart a lot of basic instincts that they may have, you know, social instincts to be in a group of size where they can identify other individuals, which let's say chickens and turkeys might do, if we're talking about 20 or 30 or even 50 individuals. But when you've got 20,000 birds in a single shed, that's not possible. Instincts to play, which many animals have. We're talking about young animals, pigs for example, playful intelligent animals. Instincts to move around freely and to root around and have something to do rather than just stand and sit and lie all day and eat occasionally when the food is put in front of you. I just think there's a huge amount of suffering that is going on there and it's completely unnecessary. That's the other factor. It's not that this produces more food for human beings. It actually dramatically reduces the availability of food for human beings because when we grow crops, grain or soybeans, and feed them to animals, we get back only a small fraction of the food value that we feed to them. In some cases perhaps less than 10% in the case of feeding grain to beef cattle and in others it's more, but it's always a minority. It's always less than half of the food value.

[Sean Carroll]

Is there progress being made on factory farming? I, I might be in a bubble here. I have the impression that more food producers are Trying to be nicer to their livestock.

[Peter Singer]

Well, I think that's unfortunately largely a false impression. But it depends a little bit where you are. In the European Union and the UK there have been, you know, if you go back sort of when I first wrote Animal liberation came out 1975, so just over 50 years ago, there has been some progress. Not that producers are trying really to be nicer, but that the animal movement has succeeded in getting laws which reduce the amount of suffering, but only marginally, I would say. So you can't keep laying hens in cages, small wire cages where they can't even stretch their wings anymore. You can't keep veal calves in individual stalls where they can't turn around. Similarly, the mother pigs, which used to be kept in, in stores where they, that are too narrow for them to turn around or walk more than a single step, are no longer allowable in, in the EU and the UK and in some states of the United States, particularly California. But unfortunately in the United States, these are still standard practices. All the things I mentioned that are banned in the EU and the UK are still standard practices in the states that produce most of the animals. In other words, in Iowa and North Carolina and the south of the US And Nebraska, those states have no such laws. And so this degree of confinement goes on. And then elsewhere in the world, China has dramatically increased its production of animal products all through factory farming and with pretty much no animal welfare constraints. So I would not say globally that there's been an improvement. There has been some regional improvements.

[Sean Carroll]

Okay, well that's, I mean, I guess it's good to know if it's true, but that's, that is too bad to hear. I do hope that there are advocacy efforts going on and having some impact outside the EU to make things better.

[Peter Singer]

There certainly are advocacy efforts going on, yes. In many countries, including the, the U.S. and some extent in, in India, which is another very large country, much less in China. There's some animal welfare movement in China, but it's mostly focused on dogs and cats. So it's, it's, it's difficult. And there are, you know, there are a lot of myths like what you said about a lot of people think that things getting better. If you ask Americans, for example, do they eat products from factory farms, the proportion of people who say, oh, I only eat sort of free range or animal welfare friendly animals vastly outnumbers the extent to which there is such prediction. For example, in chicken meat, the number of chickens who are not in factory farms is two in every thousand so 99.8% of chickens produced in the United States are in factory farms. And yet the number of people who say, oh, they only eat free range and who eat Chicken is maybe 10% of the population or more.

[Sean Carroll]

Is it easier to get free range eggs than chicken meat?

[Peter Singer]

It's somewhat easier. And so I'm not sure how it is now in the eu, I think you can get eggs properly labeled as free range. And in the UK as well. Here in Australia too, we have eggs labeled free range. In the US actually, there's. It's quite easy to get eggs labeled cage free. But cage free doesn't mean free range because they might still be confined in a big shed.

[Sean Carroll]

Okay.

[Peter Singer]

And you might still have thousands of birds in the shed. So, you know, genuinely free range is harder to find. Here in Australia now we're getting producers who actually put the number of hens per hectare on their box. And that's interesting information. And it varies from 10,000 at least. Here in Australia, you can't call eggs free range if you have more than 10,000 birds per hectare. But some of them, and some of them do have 10,000 birds per hectare and some of them just have, you know, like 1200 or something. And obviously that's significant difference in quality of life for the hens.

[Sean Carroll]

I did want to get to one other topic very quickly. I'm not quite sure how it fits in. Maybe you can help us understand how it fits in. You've written about end of life decisions, which is something I'm super interested in. I think that our culture does a very bad job of taking care of people and guiding people and giving people autonomy as they approach the end of their lives. Is your stance on this something that grows out of the other things we've been talking about?

[Peter Singer]

Yes, absolutely. I mean, you could see the unifying thread of the things that I've actually worked most intensively of and where I worked not only as a philosopher, but also as an advocate in terms of trying to eliminate pointless or unnecessary suffering. So I think the suffering of factory farming is pointless and unnecessary. Pointless in that it doesn't produce more food. I think that the suffering of people in extreme poverty is unnecessary because we have the means to end it. And on a much smaller scale, the suffering of people who are terminally ill and understand that they are not going to survive very long and don't want to go through those last days or weeks or possibly months before they actually die from the disease they're suffering from is completely unnecessary, completely pointless. And actually, in Economic terms wasteful because hospital beds are expensive. But I'm not thinking of it from the point of view of healthcare economics, really. I'm thinking of it from the point of view of those people who want to die, are making a rational choice to die, given that their prospects are very poor, and yet still in many countries and jurisdictions, are not able to die, are not able to have medical assistance in dying anyway, and they don't want to go and kill themselves by jumping off a building for good reason. So I think that that's completely pointless suffering. And I'm pleased to say that over the years that I've been working on this, this has now been legalized in more and more countries, starting off with the Netherlands in the 1980s where it could began to be openly practiced. But we've now got a lot of different countries allowing this and a growing number of states in the United States as well.

[Sean Carroll]

Okay, so I do see the connection between eliminating pointless suffering. But would you also advocate for letting people just make this decision even if they weren't at the moment suffering?

[Peter Singer]

I would advocate that under certain conditions. I think they need to have good reasons. So I would not like to see anybody able to do this, even if they're just temporarily depressed and have everybody prospect of recovering or, you know, lovesick teenagers whose partner has broken up with them and think that they'll never be happy again. I think, you know, we need a certain amount of paternalism, in other words, here, not an absolute autonomy overrides everything here. But if they can give us good reasons why that might be so, then that's something that I would allow them to choose.

[Sean Carroll]

And then I promise the final thing, as you mentioned, you've not just been an ivory tower philosopher, you've been active in trying to actually make the world a better place in these directions in which we've indicated. And one of your new tools is this wonderful idea called the podcast. You're a podcaster, like all the great academics that I know. Tell us about that.

[Peter Singer]

Yes. So I retired from Princeton in 2024, and one of the things that that gave me more time to do was a podcast. And I'm doing that with the Polish philosopher I mentioned, with whom I co authored the Point of View of the Universe. And we also co authored a book on utilitarianism for Oxford University Press's very short Introduction series. And we're both interested in what it is to live well. We're both basically hedonistic utilitarians, so we're presenting that point of view but we thought it would be interesting to get a range of different views of guests who have either something to say about that because it's one of their interests, perhaps some of their research that they've been working on, what enables people to live well, or they've just people who've led interesting lives, sometimes quite long lives, sometimes not so long. So we've had a. A wide range of guests on the podcast, starting with the late psychologist Daniel Kahneman, who was a Nobel laureate, and many other guests from. From different fields. We recently had Paul Simon, the musician on, and we've also had Judy Collins, folk singer or singer, great singer. We've had Hugh Val Harari, author of Sapiens and a range of other people living more ordinary lives. Some of them have been activists. Ingrid Newkirk from People for the Ethical Treatment of Animals has been on. Some of them have been people who've lived altruistically in various ways. We've had Kakenya Nataya, who was a Maasai woman from Kenya who made a deal with her father that she would go through the genital mutilation ceremony that was typical for girls in her peer culture if he allowed her to go to high school, which girls usually didn't do. They usually got married at 13 or 14. And she ended up going to a college in the United States after high school and starting a movement called Kakenya's Dream to try and give other girls in countries where they did not have a future as an independent person, that kind of future. So it's a wide range of people who've led rich and fulfilling lives in many, many ways.

[Sean Carroll]

Okay, so Peter, I know you're new at this, but you have to tell us the name of your podcast.

[Peter Singer]

Oh, I'm sorry, right. It's called Lives well Lived. You can find it on Apple Podcasts or Spotify or wherever you get your podcasts, including of course, Mindscape.

[Sean Carroll]

I think that's a great place to end on an optimistic note after we talked about a lot of things. So, Peter Singer, thanks very much for being on the Mindscape podcast.

[Peter Singer]

Thanks a lot, Sean. It's been great talking to you.

[T-Mobile Advertiser]

Everyone deserves to be connected. T Mobile and US Cellular are joining forces. Our networks are coming together bringing more T Mobile coverage all over the country.

Switch to T Mobile and save up to 20 versus Verizon by getting built in benefits they leave out. Check the math@t mobile.com switch and now

T mobile is available in a US cellular store near you Bigger network.

The combination of T Mobiles and US Cellular's network footprints will enhance the T Mobile network's coverage. Savings versus comparable Verizon plans, plus the costs of options, benefits, plan features and taxes. And fees vary. Savings with three plus lines include third free line free via monthly bill credits. Credit Stop if you cancel any lines. Qualifying credit required.