In the first of this new series for the journal, Peter Singer responds to questions from the editors and Theron Pummer.

Collection of historical, theoretical and applied articles on the ethical considerations in the treatment of animals by human beings.

Do university ethics classes influence students’ real-world moral choices? We aimed to conduct the first controlled study of the effects of ordinary philosophical ethics classes on real-world moral choices, using non-self-report, non-laboratory behavior as the dependent measure. We assigned 1332 students in four large philosophy classes to either an experimental group on the ethics of eating meat or a control group on the ethics of charitable giving. Students in each group read a philosophy article on their assigned topic and optionally (...) viewed a related video, then met with teaching assistants for 50-minute group discussion sections. They expressed their opinions about meat ethics and charitable giving in a follow-up questionnaire (1032 respondents after exclusions). We obtained 13,642 food purchase receipts from campus restaurants for 495 of the students, before and after the intervention. Purchase of meat products declined in the experimental group (52% of purchases of at least $4.99 contained meat before the intervention, compared to 45% after) but remained the same in the control group (52% both before and after). Ethical opinion also differed, with 43% of students in the experimental group agreeing that eating the meat of factory farmed animals is unethical compared to 29% in the control group. We also attempted to measure food choice using vouchers, but voucher redemption rates were low and no effect was statistically detectable. It remains unclear what aspect of instruction influenced behavior. (shrink)

You don't say much about who you are teaching, or what subject you teach, but you do seem to see a need to justify what you are doing. Perhaps you're teaching underprivileged children, opening their minds to possibilities that might otherwise never have occurred to them. Or maybe you're teaching the children of affluent families and opening their eyes to the big moral issues they will face in life — like global poverty, and climate change. If you're doing something like (...) this, then stick with it. Giving money isn't the only way to make a difference. (shrink)

There is too much that we do not know about COVID-19. The longer we take to find it out, the more lives will be lost. In this paper, we will defend a principle of risk parity: if it is permissible to expose some members of society (e.g. health workers or the economically vulnerable) to a certain level of ex ante risk in order to minimize overall harm from the virus, then it is permissible to expose fully informed volunteers to a (...) comparable level of risk in the context of promising research into the virus. We apply this principle to three examples of risky research: skipping animal trials for promising treatments, human challenge trials to speed up vaccine development, and low-dose controlled infection or “variolation.” We conclude that if volunteers, fully informed about the risks, are willing to help fight the pandemic by aiding promising research, there are strong moral reasons to gratefully accept their help. To refuse it would implicitly subject others to still graver risks. (shrink)

[Newspaper Opinion] Before the COVID-19 pandemic and the accompanying fall in oil prices, a carbon price would have been immediately painful for the countries that imposed it, but far better for everyone over the longer term. In this unprecedented moment, introducing a carbon price would be beneficial both now and for the future.

In recent years, bioethical discourse around the topic of ‘genetic enhancement’ has become increasingly politicized. We fear there is too much focus on the semantic question of whether we should call particular practices and emerging bio-technologies such as CRISPR ‘eugenics’, rather than the more important question of how we should view them from the perspective of ethics and policy. Here, we address the question of whether ‘eugenics’ can be defended and how proponents and critics of enhancement should engage with each (...) other. (shrink)

Should the law recognize an elephant’s right to be released from solitary confinement? The New York State Court of Appeals—the highest court in the State of New York—will consider this question on May 18. At issue is an Asian elephant named Happy. But happy she is not. Every human being has a right to bodily liberty because they have strong interests that this right protects. Since Happy has the same strong interests, the Court should recognize Happy’s right to be freed (...) from solitary confinement. (shrink)

Freedom of speech has traditionally been a cause championed by the left and liberal side of the political spectrum, against conservatives who have tried to limit the expression of radical ideas. Here are three examples from the United States: 1) When I was appointed to Princeton University in 1999, Steve Forbes, whose father had endowed the university’s Forbes College, called for my appointment to be rescinded, and pledged that he would not donate to the university as long as I was (...) on the faculty. Forbes was, at the time, running for the Republican nomination for president. (shrink)

We present evidence from a pre-registered experiment indicating that a philosophical argument––a type of rational appeal––can persuade people to make charitable donations. The rational appeal we used follows Singer’s well-known “shallow pond” argument (1972), while incorporating an evolutionary debunking argument (Paxton, Ungar, & Greene 2012) against favoring nearby victims over distant ones. The effectiveness of this rational appeal did not differ significantly from that of a well-tested emotional appeal involving an image of a single child in need (Small, Loewenstein, (...) and Slovic 2007). This is a surprising result, given evidence that emotions are the primary drivers of moral action, a view that has been very influential in the work of development organizations. We did not find support for our pre-registered hypothesis that combining our rational and emotional appeals would have a significantly stronger effect than either appeal in isolation. However, our finding that both kinds of appeal can increase charitable donations is cause for optimism, especially concerning the potential efficacy of well-designed rational appeals. We consider the significance of these findings for moral psychology, ethics, and the work of organizations aiming to alleviate severe poverty. (shrink)

We present ethical reasons that the court should grant the Nonhuman Rights Project’s (NhRP) request for habeas corpus relief for Happy, an elephant. Happy has a basic interest in not being confined, an interest that should be legally protected just as the human interest in not being confined is legally protected. Since the decision in The Nonhuman Rights Project, Inc. v Breheny failed to weigh Happy’s interests properly, we ask this body to correct the error.

We argue on consequentialist grounds for the transfer of Sandai, an orangutan, to an orangutan sanctuary. First, we show that satisfying his interest in being transferred brings far greater value than the value achieved by keeping him confined. Second, we show that he has the capacities sufficient for personhood. Third, we show that all persons have a right to relative liberty insofar as they have interests they can exercise only under conditions of relative liberty. Fourth, we show that individuals need (...) not be able to assume social obligations and duties in order to be rights holders. -/- Our argument reflects commitments, as we say, to consequentialist reasoning about moral problems. However, we note that influential representatives of the other dominant ethical traditions—the deontological and Aristotelian traditions—reach our conclusion, too. It makes no difference, in this instance, which ethical theory one adopts. Under all of them, Sandai is a person with an interest in relative liberty entitled to habeas corpus protection. (shrink)

Disagreement has been grist to the mills of sceptics throughout the history of philosophy. Recently, though, some philosophers have argued that widespread philosophical disagreement supports a broad scepticism about philosophy itself. In this paper, I argue that the task for sceptics of philosophy is considerably more complex than commonly thought. The mere fact that philosophical methods fail to generate true majority views is not enough to support the sceptical challenge from disagreement. To avoid demanding something that human reasoning cannot supply, (...) sceptics must show that philosophers have sufficient overlap to resolve their disagreements in particular concrete cases. (shrink)

This paper presents a passage from Peter Singer on the pond analogy and comments on its content and use in the classroom, especially with respect to the development of the learners' argumentative skills.

Peter Singer’s famous and influential article is criticised in three main ways that can be considered libertarian, although many non-libertarians could also accept them: 1) the relevant moral principle is more plausibly about upholding an implicit contract rather than globalising a moral intuition that had local evolutionary origins; 2) its principle of the immorality of not stopping bad things is paradoxical, as it overlooks the converse aspect that would be the positive morality of not starting bad things and (...) also thereby conceptually eliminates innocence; and 3) free markets—especially international free trade—have been cogently explained to be the real solution to the global “major evils” of “poverty” and “pollution”, while “overpopulation” does not exist in free-market frameworks; hence charity is a relatively minor alleviant to the problem of insufficiently free markets. There are also various subsidiary arguments throughout. (shrink)

Forthy years after the issue of Animal Liberation (1975), this essay tries to make a critical assessment of the theses of Peter Singer on the moral status of animals, showing their historical evolution. Notwithstanding the limits of his utilitarian theoretical view, a good part of Singer’s moral reflection about animals reveals itself convincing and is finding some achievements in the positive legislation of a lot of countries. Following David DeGrazia, the author develops Singer’s theses in a (...) gradualist direction, pointing out that the problems of utilitarianism do not compromise the validity of the principle of equal consideration of interests, nor the main practical out-comes that the Australian philosopher draws from it. (shrink)

As parents of a young woman who very much resembles Ashley, we recognize the way her parents speak of their daughter’s preciousness, and of the love and joy she brings into their life. We know too well the hardships associated with rearing a child with severe physical and intellectual disabilities, especially in our own society, unyielding as it is to the medical needs even “normals” have. We would not have our daughter Sesha undergo similar interventions. We do not believe she (...) is a perpetual child, even if her intellectual capacities do not exceed those of a child, for she has lived for thirty-seven years in this world and with that has acquired knowledge, sensitivities, and sensibilities that no child of “comparable” capacities could have. (shrink)

Concerning abortion and infanticide, ethics has always seen to each one as quite puzzling an issue. The dilemma expectedly goes like this: “Are they morally good, permissible or acceptable, or are they not?” All three major approaches in ethics, viz. virtue ethics, deontology and consequentialism, have fervently exerted themselves in order to settle both. A virtue ethicist is expected to approach the issue wondering: “Is performing abortion and infanticide indicative of virtues, to wit of character traits that the virtuous agent (...) possesses?” A deontologist would bring the dilemma up for discussion asking: “Is conducting abortion and infanticide in accordance with some moral rule or principle?” To an act utilitarian, on the other hand, the same question would strike as: “Do abortion and infanticide promote the best consequences, to wit those in which happiness is maximized?” All three approaches have been applied to the subject matter ever since the classic era, sadly with no remarkable success and, most of the times, even without the slightest suspicion of the promised rigor. (shrink)

A short encyclopedia article on Peter Singer which discusses his views on the obligations that the global wealthy have to the global poor and on our obligations to non-human animals.

In the third edition of ‘Practical Ethics’ (2011), Peter Singer reexamines the so-called “replaceability argument,” according to which merely sentient beings, as opposed to persons (self-conscious and with a robust sense of time), are replaceable—it is in principle permissible to kill them provided that they live pleasant lives that they would not have had otherwise and that they be replaced by equally happy beings. On this view, existence is a benefit and death is not a harm. Singer’s (...) challenge is to avoid (i) the replaceability of persons while preserving the replaceability of merely sentient beings, (ii) the implication that parents are morally required to procreate if they can have happy children, and (iii) to do avoid these implications without having the proposed solution (the “debit view” of preferences) imply negative utilitarianism, or the conclusion that a nonsentient universe is better than any sentient universe. I review Singer’s changing views since 1975 and I argue that his attempt to avoid the replaceability of persons fails: either both non-persons and persons are replaceable or neither are. Singer can only avoid this conclusion by appealing to controversial metaethical claims (attitude-independent moral objectivism) and/or giving up on essential features of utilitarianism. (shrink)

This work is an examination of Peter Singer’s notion of speciesism: case for animal rights in Ejagham culture. It primarily deals with an evaluation of the phenomenon of animal rights from the standpoint of Peter Singer’s notion of speciesism. Singer’s notion of speciesism deals with the moral obligation humans owe to animals as against the bias or prejudice that humanity has greater moral worth than non-human animals. Most opponents of speciesism contend that, animals are not (...) members of the moral community as such humans have no moral obligation to them. Contrary to this view, proponents of speciesism argue that animals are capable of suffering and should be considered morally. Thus, the emphasis here is that just like many societies of the world, the Ejagham people are guilty of speciesism. Among the several ways by which speciesism is practiced, this work identifies hunting, deforestation, bush burning and fishing as ways by which the Ejagham people are guilty. Using the tool of critical analysis, evaluation and prescription, this work submits that animals have interest, as such, should be granted rights. (shrink)

Over the course of summarizing Volume Three and Does Anything Really Matter?, I argue that Parfit does not give us strong reason to think that Naturalists, Expressivists, and Non-Realist Cognitivists agree.

The editors cull the works of 11 noted French and German philosophers for their contributions to the debate about what animals are like and how we should relate to them. Each selection gives the gist of the philosopher's view followed by a noted scholar's comments. The result, as Peter Singer notes in his merciless Foreward, is that most of the Continentals have had almost nothing of interest to say on the topic.

Peter Singer argues that we’re obligated to donate our entire expendable income to aid organizations. One premiss of his argument is "If it is in your power to prevent something bad from happening, without sacrificing anything nearly as important, it is wrong not to do so." Singer defends this by noting that commonsense morality requires us to save a child we find drowning in a shallow pond. I argue that Singer’s Drowning Child thought experiment doesn’t justify (...) this premiss. I offer my own Drowning Children thought experiment, which should reveal that commonsense morality entails that premiss two is actually false. (shrink)

It is often argued that Henry Sidgwick is a conservative about moral matters, while Peter Singer is a radical. Both are exponents of a utilitarian account of morality but they use it to very different effect. I think this way of viewing the two is mistaken or, at the very least, overstated. Sidgwick is less conservative than has been suggested and Singer is less radical than he initially seems. To illustrate my point, I will rely on what (...) each has to say about the moral demands of suffering and destitution. (shrink)

Epistemic defeat is standardly understood in either evidentialist or responsibilist terms. The seminal treatment of defeat is an evidentialist one, due to John Pollock, who famously distinguishes between undercutting and rebutting defeaters. More recently, an orthogonal distinction due to Jennifer Lackey has become widely endorsed, between so-called doxastic (or psychological) and normative defeaters. We think that neither doxastic nor normative defeaters, as Lackey understands them, exist. Both of Lackey’s categories of defeat derive from implausible assumptions about epistemic responsibility. Although Pollock’s (...) evidentialist view is superior, the evidentialism per se can be purged from it, leaving a general structure of defeat that can be incorporated in a reliabilist theory that is neither evidentialist nor responsibilist in any way. (shrink)

We propose a solution to the problem of logical omniscience in what we take to be its fundamental version: as concerning arbitrary agents and the knowledge attitude per se. Our logic of knowledge is a spin-off from a general theory of thick content, whereby the content of a sentence has two components: an intension, taking care of truth conditions; and a topic, taking care of subject matter. We present a list of plausible logical validities and invalidities for the logic of (...) knowledge per se for arbitrary agents, and isolate three explanatory factors for them: the topic-sensitivity of content; the fragmentation of knowledge states; the defeasibility of knowledge acquisition. We then present a novel dynamic epistemic logic that yields precisely the desired validities and invalidities, for which we provide expressivity and completeness results. We contrast this with related systems and address possible objections. (shrink)

Our topic is the theory of topics. My goal is to clarify and evaluate three competing traditions: what I call the way-based approach, the atom-based approach, and the subject-predicate approach. I develop criteria for adequacy using robust linguistic intuitions that feature prominently in the literature. Then I evaluate the extent to which various existing theories satisfy these constraints. I conclude that recent theories due to Parry, Perry, Lewis, and Yablo do not meet the constraints in total. I then introduce the (...) issue-based theory—a novel and natural entry in the atom-based tradition that meets our constraints. In a coda, I categorize a recent theory from Fine as atom-based, and contrast it to the issue-based theory, concluding that they are evenly matched, relative to our main criteria of adequacy. I offer tentative reasons to nevertheless favour the issue-based theory. (shrink)

This chapter states the contrast between presumptivism about testimonial warrant (often called anti-reductionism) and strict reductionism (associated with Hume) about testimonial warrant. Presumptivism sees an analogy with modest foundationalism about perceptual warrant. Strict reductionism denies this analogy. Two theoretical frameworks for these positions are introduced to better formulate the most popular version of persumptivism, a competence reliabilist account. Seven arguments against presumptivism are then stated and critiqued: (1) The argument from reliability; (2) The argument from reasons; (3) the argument from (...) positive reasons; (4) the argument from negative reasons; (5) the argument from agency; (6) the argument from psychological force; and (7) the argument from gullibility. If presumptivm is false, it is not for any of these arguments. (shrink)

In the mid-seventeenth century a movement of self-styled experimental philosophers emerged in Britain. Originating in the discipline of natural philosophy amongst Fellows of the fledgling Royal Society of London, it soon spread to medicine and by the eighteenth century had impacted moral and political philosophy and even aesthetics. Early modern experimental philosophers gave epistemic priority to observation and experiment over theorising and speculation. They decried the use of hypotheses and system-building without recourse to experiment and, in some quarters, developed a (...) philosophy of experiment. The movement spread to the Netherlands and France in the early eighteenth century and later impacted Germany. Its important role in early modern philosophy was subsequently eclipsed by the widespread adoption of the Kantian historiography of modern philosophy, which emphasised the distinction between rationalism and empiricism and had no place for the historical phenomenon of early modern experimental philosophy. The re-emergence of interest in early modern experimental philosophy roughly coincided with the development of contemporary x-phi and there are some important similarities between the two. (shrink)

We initially characterize what we’ll call existence problems as problems where there is evidence that a putative entity exists and this evidence is not easily dismissed; however, the evidence is not adequate to justify the claim that the entity exists, and in particular the entity hasn’t been detected. The putative entity is elusive. We then offer a strategy for determining whether an existence problem is philosophical or scientific. According to this strategy (1) existence problems are characterized in terms of causal (...) roles, and (2) these problems are categorized as scientific or philosophical on the basis of the epistemic context of putative realizers. We argue that the first step of the strategy is necessary to avoid begging the question with regard to categorization of existence problems, and the second step categorizes existence problems on the basis of a distinction between two ways in which an entity can be elusive. This distinction between kinds of elusiveness takes as background a standard account of inference to the best explanation. Applying this strategy, we argue that the existence of a multiverse is a scientific problem. (shrink)

The understanding of the primary-secondary quality distinction has shifted focus from the mechanical philosophers’ proposal of primary qualities as explanatorily fundamental to current theorists’ proposal of secondary qualities as metaphysically perceiver dependent. The chapter critically examines this shift and current arguments to uphold the primary-secondary quality distinction on the basis of the perceiver dependence of color; one focus of the discussion is the role of qualia in these arguments. It then describes and criticizes reasons for characterizing color, smell, taste, sound, (...) and warmth and color as secondary qualities on the basis of our commonsense divisions among sensory modalities; Grice’s proposal for distinguishing among the sensory modalities is focal here. The general conclusion is that reasons for drawing the primary-secondary quality distinction are unconvincing. (shrink)

Some people (e.g., Drs. Paul and Susan Lim) and, with them, organizations (e.g., the National Embryo Donation Center) believe that, morally speaking, the death of a frozen human embryo is a very bad thing. With such people and organizations in mind, the question to be addressed here is as follows: if one believes that the death of a frozen embryo is a very bad thing, ought, morally speaking, one prevent the death of at least one frozen embryo via embryo adoption? (...) By way of a three‐premise argument, one of which is a moral principle first introduced by Peter Singer, my answer to this question is: at least some of those who believe this ought to. (Just who the “some” are is identified in the paper.) If this is correct, then, for said people, preventing the death of a frozen embryo via embryo adoption is not a morally neutral matter; it is, instead, a morally laden one. Specifically, their intentional refusal to prevent the death of a frozen embryo via embryo adoption is, at a minimum, morally criticizable and, arguably, morally forbidden. Either way, it is, to one extent or another, a moral failing. (shrink)

Social knowledge, for the most part, is knowledge through testimony. This essay is an overview of the epistemology of testimony. The essay separates knowledge from justification, characterizes testimony as a source of belief, explains why testimony is a source of knowledge, canvasses arguments for anti-reductionism and for reductionism in the reductionism vs. anti-reductionism debate, addresses counterexamples to knowledge transmission, defends a safe basis account of testimonial knowledge, and turns to social norms as a partial explanation for the reliability of testimony.

The norm of assertion, to be in force, is a social norm. What is the content of our social norm of assertion? Various linguistic arguments purport to show that to assert is to represent oneself as knowing. But to represent oneself as knowing does not entail that assertion is governed by a knowledge norm. At best these linguistic arguments provide indirect support for a knowledge norm. Furthermore, there are alternative, non-normative explanations for the linguistic data (as in recent work from (...) Van Elswyk). Direct arguments would rely on normative judgments about the permissibility or impermissibility of assertions with and without the speaker knowing the content asserted. John Turri's work experimental results purport to show that our norm of assertion is factive, and probably knowledge. But as a number of recent experimentalists (Kneer, Reuter and Broessel, Marsili and Wiegmann) have shown, Turri's results rely on the problemmatic use of 'should' as in 'Maria should assert that she owns a 1990 watch.' Correcting for this, these experimentalists provide strong evidence that our norm of assertion is not factive. The standard reply to evidence like this from the assertion of unlucky falsehoods is the excuse maneuver. But Marsili and Wiegmann, following Turri's protocol for testing for excuse validation, show that participants who judge that assertions unlucky falsehoods are permissible are not guilty of excuse validation. Given our current understanding of the experimental evidence, knowledge is not our norm of assertion. (shrink)

This chapter examines the spectrum inversion hypothesis as an argument against certain kinds of account of what it’s like to be conscious of color. The hypothesis aims to provide a counterexample to accounts of what it’s like to be conscious of color in non-qualitative terms, as well as to accounts of what it’s like to be conscious of color in terms of the representational content of conscious visual states (which, according to some philosophers, is in turn given an account in (...) non-qualitative terms). I explain the hypothesis’s reasoning in sections 1 and 2. I then take up background issues: since the counterexample provided by the hypothesis is typically given as a possibility rather than an actuality, I briefly discuss the kind of possibility involved in section 3, and the methodologies used to evaluate the plausibility of possibilities in section 4. In section 5, I describe some general considerations that are commonly used against the spectrum inversion hypothesis. I take up attempts to support the hypothesis with findings from color science in section 6. I end with comments skeptical of both the motivation for the spectrum inversion hypothesis and the methodology used to support it. (shrink)

Peter Singer argues, on consequentialist grounds, that individuals ought to be vegetarian. Many have pressed, in response, a causal impotence objection to Singer’s argument: any individual person’s refraining from purchasing and consuming animal products will not have an important effect on contemporary farming practices. In this paper, I sketch a Singer-inspired consequentialist argument for vegetarianism that avoids this objection. The basic idea is that, for agents who are aware of the origins of their food, continuing to (...) consume animal products is morally bad because it leads to not appropriately disvaluing the origins of their food. That is a morally bad outcome that can be avoided by becoming vegetarian. (shrink)

Polarization is a topic of intense interest among social scientists, but there is significant disagreement regarding the character of the phenomenon and little understanding of underlying mechanics. A first problem, we argue, is that polarization appears in the literature as not one concept but many. In the first part of the article, we distinguish nine phenomena that may be considered polarization, with suggestions of appropriate measures for each. In the second part of the article, we apply this analysis to evaluate (...) the types of polarization generated by the three major families of computational models proposing specific mechanisms of opinion polarization. (shrink)