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Conversations regarding the ethics of eating meat are focused on whether or not it is moral to eat non-human
animal Animals are multicellular, eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, can reproduce sexually, and go through an ontogenetic stage ...
s. Ultimately, this is a debate that has been ongoing for millennia, and it remains one of the most prominent topics in food ethics. Individuals who promote meat consumption do so for a number of reasons, such as health, cultural traditions, religious beliefs, and scientific arguments that support the practice and generally argue that making a meat-free diet a social goal for all would be wrong because it fails to consider the individual nutritional needs of humans at various stages of life, fails to account for biological differences between the sexes, ignores the reality of human evolution, ignores various cultural considerations, or because it would limit the adaptability of the human species. People who abstain from eating
meat Meat is animal flesh that is eaten as food. Humans have hunted, farmed, and scavenged animals for meat since prehistoric times. The establishment of settlements in the Neolithic Revolution allowed the domestication of animals such as chic ...
are generally known as " vegetarians" or "
vegans Veganism is the practice of abstaining from the use of animal product—particularly in diet—and an associated philosophy that rejects the commodity status of animals. An individual who follows the diet or philosophy is known as a vegan. Di ...
". They avoid meat for various reasons such as taste preferences,
religion Religion is usually defined as a social- cultural system of designated behaviors and practices, morals, beliefs, worldviews, texts, sanctified places, prophecies, ethics, or organizations, that generally relates humanity to supernatur ...
,
animal welfare Animal welfare is the well-being of non-human animals. Formal standards of animal welfare vary between contexts, but are debated mostly by animal welfare groups, legislators, and academics. Animal welfare science uses measures such as longevit ...
, the environmental impact of meat production (''
environmental vegetarianism Environmental vegetarianism is the practice of vegetarianism when motivated by the desire to create a sustainable diet that avoids the negative environmental impact of meat production. Livestock as a whole is estimated to be responsible for aro ...
''),
health Health, according to the World Health Organization, is "a state of complete physical, mental and social well-being and not merely the absence of disease and infirmity".World Health Organization. (2006)''Constitution of the World Health Organ ...
considerations, and
antimicrobial resistance Antimicrobial resistance (AMR) occurs when microbes evolve mechanisms that protect them from the effects of antimicrobials. All classes of microbes can evolve resistance. Fungi evolve antifungal resistance. Viruses evolve antiviral resistance. P ...
.
Vegans Veganism is the practice of abstaining from the use of animal product—particularly in diet—and an associated philosophy that rejects the commodity status of animals. An individual who follows the diet or philosophy is known as a vegan. Di ...
also abstain from other
animal product An animal product is any material derived from the body of an animal. Examples are fat, flesh, blood, milk, eggs, and lesser known products, such as isinglass and rennet. Animal by-products, as defined by the USDA, are products harvested or ma ...
s, such as dairy products and eggs, for similar reasons. " Ethical omnivores" are individuals who object to the practices underlying the production of meat, as opposed to the act of consuming meat itself. In this respect, many people who abstain from certain kinds of meat eating and animal products do not take issue with meat consumption in general, provided that the meat and animal products are produced in a specific manner. Ethical omnivores may object to rearing animals for meat in
factory farm Intensive animal farming or industrial livestock production, also known by its opponents as factory farming and macro-farms, is a type of intensive agriculture, specifically an approach to animal husbandry designed to maximize production, while ...
s, killing animals in ways that cause pain, and feeding animals unnecessary antibiotics or hormones. To this end, they may avoid meats such as
veal Veal is the meat of calves, in contrast to the beef from older cattle. Veal can be produced from a calf of either sex and any breed, however most veal comes from young male calves of dairy breeds which are not used for breeding. Generally, v ...
,
foie gras Foie gras (, ; ) is a specialty food product made of the liver of a duck or goose. According to French law, foie gras is defined as the liver of a duck or goose fattened by gavage (force feeding). Foie gras is a popular and well-known delica ...
, meat from animals that were not
free range Free range denotes a method of farming husbandry where the animals, for at least part of the day, can roam freely outdoors, rather than being confined in an enclosure for 24 hours each day. On many farms, the outdoors ranging area is fenced, ...
, animals that were fed antibiotics or hormones, etc. In a 2014 survey of 406 US philosophy professors, approximately 60% of
ethicist An ethicist is one whose judgment on ethics and ethical codes has come to be trusted by a specific community, and (importantly) is expressed in some way that makes it possible for others to mimic or approximate that judgment. Following the advice of ...
s and 45% of non-ethicist philosophers said it was at least somewhat "morally bad" to eat meat from mammals. A 2020 survey of 1812 published English-language philosophers found that 48% said it was permissible to eat animals in ordinary circumstances, while 45% said it was not. The '' World Scientists' Warning to Humanity'' (2017), the most co-signed scientific journal article in history, called (among other things) for a transition to plant-based diets in order to combat
climate change In common usage, climate change describes global warming—the ongoing increase in global average temperature—and its effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to ...
.


Overview of arguments for and against meat eating

Conversations regarding the ethics of meat eating have been ongoing for thousands of years, possibly longer.
Pythagoras Pythagoras of Samos ( grc, Πυθαγόρας ὁ Σάμιος, Pythagóras ho Sámios, Pythagoras the Samian, or simply ; in Ionian Greek; ) was an ancient Ionian Greek philosopher and the eponymous founder of Pythagoreanism. His poli ...
, a Greek
mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...
and
philosopher A philosopher is a person who practices or investigates philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom'. The coining of the term has been attributed to the Greek th ...
who lived during the 6th century BC, made the case against eating animals on grounds of their having souls like humans. Taking an entirely different approach,
Plato Plato ( ; grc-gre, Πλάτων ; 428/427 or 424/423 – 348/347 BC) was a Greek philosopher born in Athens during the Classical period in Ancient Greece. He founded the Platonist school of thought and the Academy, the first institution ...
, an Athenian philosopher who lived during the 4th century BC, argued that meat is a luxury item that requires a lot of land to procure. As a result, he stated that the unmoderated consumption of meat would lead to conflict over land and, ultimately, an unsustainable society.
Xenophon Xenophon of Athens (; grc, Ξενοφῶν ; – probably 355 or 354 BC) was a Greek military leader, philosopher, and historian, born in Athens. At the age of 30, Xenophon was elected commander of one of the biggest Greek mercenary armies o ...
expressed similar concerns to Plato: Rene Descartes, a 17th-century French philosopher, mathematician, and scientist, disagreed with the aforementioned stances. He argued that animals were not conscious. As a result, he asserted that there is nothing ethically wrong with consuming meat or causing animals physical pain.
Immanuel Kant Immanuel Kant (, , ; 22 April 1724 – 12 February 1804) was a German philosopher and one of the central Enlightenment thinkers. Born in Königsberg, Kant's comprehensive and systematic works in epistemology, metaphysics, ethics, and ...
also argued that there is nothing ethically wrong with meat consumption. He claimed that it was personhood that distinguished humans from animals and that, since animals are not actual persons, there was nothing wrong with killing or consuming them.
Peter Singer Peter Albert David Singer (born 6 July 1946) is an Australian moral philosopher, currently the Ira W. DeCamp Professor of Bioethics at Princeton University. He specialises in applied ethics and approaches ethical issues from a secular ...
, a
Princeton University Princeton University is a private research university in Princeton, New Jersey. Founded in 1746 in Elizabeth as the College of New Jersey, Princeton is the fourth-oldest institution of higher education in the United States and one of the ...
and
University of Melbourne The University of Melbourne is a public research university located in Melbourne, Australia. Founded in 1853, it is Australia's second oldest university and the oldest in Victoria. Its main campus is located in Parkville, an inner suburb ...
professor and pioneer of the
animal liberation movement The animal rights (AR) movement, sometimes called the animal liberation, animal personhood, or animal advocacy movement, is a social movement that seeks an end to the rigid moral and legal distinction drawn between human and non-human animals, ...
, argues that, because non-human animals feel, they should be treated according to utilitarian ethics. In his ethical philosophy of what it is to be a "person", Singer ultimately argues that
livestock Livestock are the domesticated animals raised in an agricultural setting to provide labor and produce diversified products for consumption such as meat, eggs, milk, fur, leather, and wool. The term is sometimes used to refer solely to ani ...
animals feel enough to deserve better treatment than they receive. Singer's work has since been widely built upon by philosophers who agree
Mark Rowlands Mark Rowlands (born 1962) is a Welsh writer and philosopher. He is Professor of Philosophy at the University of Miami, and the author of several books on the philosophy of mind, the moral status of non-human animals, and cultural criticism. He ...
(2013). ''Animal rights: All that matters''
Hodder & Stoughton
and who do not. His essential philosophies have been largely adopted by animal rights advocates as well as by ethical vegetarians and
vegans Veganism is the practice of abstaining from the use of animal product—particularly in diet—and an associated philosophy that rejects the commodity status of animals. An individual who follows the diet or philosophy is known as a vegan. Di ...
. Many other modern thinkers have questioned the morality not only of the double standard underlying speciesism but also the double standard underlying the fact that people support treatment of cows, pigs, and chickens in ways that they would never allow with pet dogs, cats, or birds. Nick Zangwill, a British
philosopher A philosopher is a person who practices or investigates philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom'. The coining of the term has been attributed to the Greek th ...
and honorary research professor at
University College London , mottoeng = Let all come who by merit deserve the most reward , established = , type = Public research university , endowment = £143 million (2020) , budget = ...
and Lincoln University, disagrees with Singer's conclusions about the moral necessity of not eating meat. In '' Our Moral Duty to Eat Meat,'' which was published by
Cambridge University Press Cambridge University Press is the university press of the University of Cambridge. Granted letters patent by King Henry VIII in 1534, it is the oldest university press in the world. It is also the King's Printer. Cambridge University Pr ...
, Zangwill argues that the existence of domesticated animals depends on the practice of eating them, and that meat eating has historically benefitted many millions of animals and given them good lives. Consequently, he claims that eating non-human animal meat is not merely permissible but also good for many millions of animals. However, Zangwill clarifies that this argument does not apply to factory farm animals, as they do not have good lives. Thus, when he speaks of meat eating being justified, he means only meat from animals that overall have a good life. Proponents of meat eating who subscribe to Zangwill's views argue that practices like well-managed free-range rearing and the consumption of hunted animals, particularly from species whose natural predators have been significantly eliminated, could satisfy the demand for mass-produced, ethically sourced meat. Ethical vegetarians say that the reasons for not hurting or killing animals are similar to the reasons for not hurting or killing humans. They argue that killing an animal, like killing a human, can only be justified in extreme circumstances, such as when one's life is threatened. Consuming a living creature just for its taste, for convenience, or out of habit is not justifiable. Some ethicists have added that humans, unlike other animals, are morally conscious of their behavior and have a choice; this is why there are laws governing human behavior, and why it is subject to moral standards. Ethical vegetarian concerns have become more widespread in developed countries, particularly because of the spread of factory farming, more open and graphic documentation of what human meat-eating entails for the animal, and environmental consciousness. Reducing the worldwide massive
food waste Food loss and waste is food that is not eaten. The causes of food waste or loss are numerous and occur throughout the food system, during production, processing, distribution, retail and food service sales, and consumption. Overall, about o ...
would also contribute to reduce meat waste and therefore save animals. Some have described unequal treatment of humans and animals as a form of speciesism such as
anthropocentrism Anthropocentrism (; ) is the belief that human beings are the central or most important entity in the universe. The term can be used interchangeably with humanocentrism, and some refer to the concept as human supremacy or human exceptionalism. ...
or human-centeredness. Val Plumwood (1993, 1996) has argued that anthropocentrism plays a role in green theory that is analogous to androcentrism in feminist theory and
ethnocentrism Ethnocentrism in social science and anthropology—as well as in colloquial English discourse—means to apply one's own culture or ethnicity as a frame of reference to judge other cultures, practices, behaviors, beliefs, and people, instead o ...
in anti-racist theory. Plumwood calls human-centredness "anthropocentrism" to emphasize this parallel. By analogy with
racism Racism is the belief that groups of humans possess different behavioral traits corresponding to inherited attributes and can be divided based on the superiority of one race over another. It may also mean prejudice, discrimination, or antagoni ...
and
sexism Sexism is prejudice or discrimination based on one's sex or gender. Sexism can affect anyone, but it primarily affects women and girls.There is a clear and broad consensus among academic scholars in multiple fields that sexism refers pri ...
,
Melanie Joy Melanie Joy (born September 2, 1966) is an American social psychologist and author, primarily notable for coining and promulgating the term carnism. She is the founding president of nonprofit advocacy group Beyond Carnism, previously known as Ca ...
has dubbed meat-eating " carnism". The
animal rights movement The animal rights (AR) movement, sometimes called the animal liberation, animal personhood, or animal advocacy movement, is a social movement that seeks an end to the rigid moral and legal distinction drawn between human and non-human animals, ...
seeks an end to the rigid moral and legal distinction drawn between human and non-human animals, an end to the status of animals as property, and an end to their use in the
research Research is "creative and systematic work undertaken to increase the stock of knowledge". It involves the collection, organization and analysis of evidence to increase understanding of a topic, characterized by a particular attentiveness ...
, food,
clothing Clothing (also known as clothes, apparel, and attire) are items worn on the body. Typically, clothing is made of fabrics or textiles, but over time it has included garments made from animal skin and other thin sheets of materials and natura ...
, and entertainment industries.


Animal consciousness

Ethologist Ethology is the scientific study of animal behaviour, usually with a focus on behaviour under natural conditions, and viewing behaviour as an evolutionarily adaptive trait. Behaviourism as a term also describes the scientific and objectiv ...
Jane Goodall Dame Jane Morris Goodall (; born Valerie Jane Morris-Goodall on 3 April 1934), formerly Baroness Jane van Lawick-Goodall, is an English primatologist and anthropologist. Seen as the world's foremost expert on chimpanzees, Goodall is best kn ...
stated in the 2009 book ''The Inner World of Farm Animals'' that "farm animals feel pleasure and sadness, excitement and resentment, depression, fear and pain. They are much more sensitive and intelligent than we ever imagined." In 2012, a group of well known
neuroscientist A neuroscientist (or neurobiologist) is a scientist who has specialised knowledge in neuroscience, a branch of biology that deals with the physiology, biochemistry, psychology, anatomy and molecular biology of neurons, neural circuits, and glial ...
s stated in the "Cambridge Declaration on Consciousness in Non-Human Animals" that all mammals and birds (such as farm animals), and other animals, possess the neurological substrates that generate consciousness and are able to experience affective states. Eugene Linden, author of ''The Parrot's Lament'', suggests that many examples of animal behavior and intelligence seem to indicate both emotion and a level of consciousness that we would normally ascribe only to our own species. Philosopher
Daniel Dennett Daniel Clement Dennett III (born March 28, 1942) is an American philosopher, writer, and cognitive scientist whose research centers on the philosophy of mind, philosophy of science, and philosophy of biology, particularly as those fields relat ...
counters: Philosophers
Peter Singer Peter Albert David Singer (born 6 July 1946) is an Australian moral philosopher, currently the Ira W. DeCamp Professor of Bioethics at Princeton University. He specialises in applied ethics and approaches ethical issues from a secular ...
(Princeton), Jeff McMahan (Oxford) and others also counter that the issue is not one of consciousness, but of
sentience Sentience is the capacity to experience feelings and sensations. The word was first coined by philosophers in the 1630s for the concept of an ability to feel, derived from Latin '' sentientem'' (a feeling), to distinguish it from the ability to ...
.


Pain

A related argument revolves around non-human organisms' ability to feel pain. If animals could be shown to suffer, as humans do, then many of the arguments against human suffering could be extended to animals. One such reaction is transmarginal inhibition, a phenomenon observed in humans and some animals akin to
mental breakdown A mental disorder, also referred to as a mental illness or psychiatric disorder, is a behavioral or mental pattern that causes significant distress or impairment of personal functioning. Such features may be persistent, relapsing and remitt ...
. As noted by John Webster (emeritus professor of
animal husbandry Animal husbandry is the branch of agriculture concerned with animals that are raised for meat, fibre, milk, or other products. It includes day-to-day care, selective breeding, and the raising of livestock. Husbandry has a long history, starti ...
at the
University of Bristol , mottoeng = earningpromotes one's innate power (from Horace, ''Ode 4.4'') , established = 1595 – Merchant Venturers School1876 – University College, Bristol1909 – received royal charter , type ...
): Various programs operate around the world that promote the notion that animals raised for food can be treated humanely. Some spokespeople for the factory farming industry argue that the animals are better off in total confinement. For example, according to F J "Sonny" Faison, president of Carroll's Foods: In response, animal welfare advocates ask for evidence that any factory-bred animal is better off caged than free.
Farm Sanctuary Farm Sanctuary is an American animal protection organization, founded in 1986 as an advocate for farmed animals. It was America's first shelter for farmed animals. It promotes laws and policies that support animal welfare, animal protection, a ...
argue that commodifying and slaughtering animals is incompatible with the definition of "humane". Animal ethicists such as Gary Francione have argued that reducing animal suffering is not enough; it needs to be made illegal and abolished.
Steven Best Steven Best (born December 1955) is an American philosopher, writer, speaker and activist. His concerns include animal rights, species extinction, human overpopulation, ecological crisis, biotechnology, liberation politics, terrorism, mass media ...
challenges this notion, and argues that factory farm conditions "resemble the mechanized production lines of concentration camps" where animals are "forced to produce maximal quantities of meat, milk, and eggs—an intense coercion that takes place through physical confinement but also now through chemical and genetic manipulation. As typical in Nazi compounds, this forced and intensive labor terminates in death."
David Nibert David Alan Nibert (born 1953) is an American sociologist, author, activist and professor of sociology at Wittenberg University. He is the co-organizer of the Section on Animals and Society of the American Sociological Association. In 2005, he re ...
says that sentient animals are treated as mere inanimate objects and "biomachines" in factory farms, or CAFOs, where they are often confined in darkness with no opportunity for engaging in natural activity, are mutilated to prevent pathological behaviors in overcrowded conditions, and genetically manipulated to the point where many can't even stand. David Benatar contends that of the 63 billion land animals killed annually to provide humans with meat products, the vast majority of them die painful and stressful deaths: Writing in ''
Current Affairs Current affairs may refer to: News * ''Current Affairs'' (magazine) a bimonthly magazine of culture and politics. * Current affairs (news format): a genre of broadcast journalism * Current Affairs, former name for Behind the News Politics * An ...
'',
Nathan J. Robinson Nathan James Robinson (born c. 1989) is an English-American journalist, political commentator, and editor-in-chief of the left-wing progressive ''Current Affairs'' magazine, which he founded in 2015. Early life and education Born in Stevena ...
describes the billions of non-human animals that suffer and die at the hands of human beings for consumption as a "holocaust" and, citing Jeremy Bentham's formulation "The question is not, Can they reason? nor, Can they talk? but, ''Can they suffer''?" contends that it is "morally reprehensible" and "deeply wrong". Conversely,
Jan Narveson Jan Narveson (; born 1936) is professor of philosophy emeritus at the University of Waterloo, in Waterloo, Ontario, Canada. An anarcho-capitalist and contractarian, Narveson's ideology is deeply influenced by the thought of Robert Nozick and Da ...
argues that under certain theories of utilitarianism, positive utility can be increased by having more living organisms to experience it and thus by increasing the animal population so it can later be eaten, these theories could potentially justify raising animals for the purposes of consumption. Critics of ethical vegetarianism say that there is no agreement on where to draw the line between organisms that can and cannot feel. Justin Leiber, a philosophy professor at
Oxford University Oxford () is a city in England. It is the county town and only city of Oxfordshire. In 2020, its population was estimated at 151,584. It is north-west of London, south-east of Birmingham and north-east of Bristol. The city is home to the ...
, writes that: There are also some who argue that, although only suffering animals feel anguish, plants, like all organisms, have evolved mechanisms for survival. No living organism can be described as "wanting" to die for another organism's sustenance. In an article written for ''The New York Times'', Carol Kaesuk Yoon argues that: Supporters of ethical vegetarianism argue that support for
plant rights Plant rights are rights to which plants may be entitled. Such issues are often raised in connection with discussions about human rights, animal rights, biocentrism, or sentiocentrism. Philosophy Samuel Butler's ''Erewhon'' contains a chapter, ...
obligates abstaining from meat, due to the use of plants to rear animals. For example, the
feed conversion ratio In animal husbandry, feed conversion ratio (FCR) or feed conversion rate is a ratio or rate measuring of the efficiency with which the bodies of livestock convert animal feed into the desired output. For dairy cows, for example, the output is milk ...
for beef can require 4.5–7.5 kg of plant food to be used to produce 1 kg of beef.Dan W. Shike, Ph.D., University of Illinois at Urbana-Champaign Driftless Region Beef Conference 201
Beef Cattle Feed Efficiency
/ref>
PETA Peta or PETA may refer to: Acronym * Pembela Tanah Air, a militia established by the occupying Japanese in Indonesia in 1943 * People for the Ethical Treatment of Animals, an American animal rights organization * People Eating Tasty Animals, a ...
states that "Whether it can be proved that plants experience pain or not, vegan foods are the compassionate choice because they require the deaths of fewer plants ''and'' animals." Peter Singer has pointed out that the ethical argument for vegetarianism may not apply to all non-vegetarian food. For example, any arguments against causing pain to animals would not apply to animals that do not feel pain. It has also often been noted that, while it takes a lot more grain to feed some animals such as cows for human consumption than it takes to feed a human directly, not all animals consume land plants (or other animals that consume land plants). For example,
oyster Oyster is the common name for a number of different families of salt-water bivalve molluscs that live in marine or brackish habitats. In some species, the valves are highly calcified, and many are somewhat irregular in shape. Many, but not ...
s consume underwater plankton and algae. In 2010, Christopher Cox wrote: Cox went on to suggest that oysters would be acceptable to eat, even by strict ethical criteria, if they did not feel: "while you could give them the benefit of the doubt, you could also say that unless some new evidence of a capacity for pain emerges, the doubt is so slight that there is no good reason for avoiding eating sustainably produced oysters." Cox has added that, although he believes in some of the ethical reasons for vegetarianism, he is not strictly a vegan or even a vegetarian because he consumes oysters.


Influences on views of animal consciousness

When people choose to do things about which they are ambivalent and which they would have difficulty justifying, they experience a state of
cognitive dissonance In the field of psychology, cognitive dissonance is the perception of contradictory information, and the mental toll of it. Relevant items of information include a person's actions, feelings, ideas, beliefs, values, and things in the environmen ...
, which can lead to rationalization,
denial Denial, in ordinary English usage, has at least three meanings: asserting that any particular statement or allegation is not true (which might be accurate or inaccurate); the refusal of a request; and asserting that a true statement is not true. ...
, or even
self-deception Self-deception is a process of denying or rationalizing away the relevance, significance, or importance of opposing evidence and logical argument. Self-deception involves convincing oneself of a truth (or lack of truth) so that one does not rev ...
. For example, a 2011 experiment found that, when the harm that their meat-eating causes animals is explicitly brought to people's attention, they tend to rate those animals as possessing fewer mental capacities compared to when the harm is not brought to their attention. This is especially evident when people expect to eat meat in the near future. Such denial makes it less uncomfortable for people to eat animals. The data suggest that people who consume meat go to great lengths to try to resolve these moral inconsistencies between their beliefs and behaviour by adjusting their beliefs about what animals are capable of feeling. This perception can lead to paradoxical conclusions about the ethics and comfort involved in preferring certain types of meat over others. For example, venison or meat from a wild deer generally has a much higher nutritional quality and a much lower carbon footprint than meat from domestically-raised animals. In addition, it can be virtually assured that the deer was never bred or raised in unnatural conditions, confined to a cage, fed an unnatural diet of grain, or injected with any artificial hormones. However, since the necessary act of killing a deer to procure the venison is generally much more apparent to anyone who encounters this sort of meat, some people can be even more uncomfortable with eating this than meat from animals raised on factory farms. Many ethical vegetarians and ethical meat-eaters argue that it is behaviour rather than supporting beliefs that should be adjusted.


Environmental argument

Some people choose to be vegetarian or vegan for environmental reasons. According to a 2006 report by LEAD ''
Livestock's Long Shadow ''Livestock's Long Shadow: Environmental Issues and Options'' is a United Nations report, released by the Food and Agriculture Organization (FAO) of the United Nations on 29 November 2006, that "aims to assess the full impact of the livestock s ...
'', "the livestock sector emerges as one of the top two or three most significant contributors to the most serious environmental problems, at every scale from local to global." The livestock sector is probably the largest source of water pollution (due to animal wastes, fertilizers, and pesticides), contributing to
eutrophication Eutrophication is the process by which an entire body of water, or parts of it, becomes progressively enriched with minerals and nutrients, particularly nitrogen and phosphorus. It has also been defined as "nutrient-induced increase in phyt ...
, human health problems, and the emergence of
antibiotic resistance Antimicrobial resistance (AMR) occurs when microbes evolve mechanisms that protect them from the effects of antimicrobials. All classes of microbes can evolve resistance. Fungi evolve antifungal resistance. Viruses evolve antiviral resistance. ...
. It accounts also for over 8% of global human water use. Livestock production is the biggest human use of land, and it accounts for around 25% of the global land surface, or two-thirds of all agricultural land. It is probably the leading player in
biodiversity loss Biodiversity loss includes the worldwide extinction of different species, as well as the local reduction or loss of species in a certain habitat, resulting in a loss of biological diversity. The latter phenomenon can be temporary or permanent, de ...
, as it causes
deforestation Deforestation or forest clearance is the removal of a forest or stand of trees from land that is then converted to non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban use. The most concentrated ...
, land degradation, pollution,
climate change In common usage, climate change describes global warming—the ongoing increase in global average temperature—and its effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to ...
, and overfishing. A 2017 study by the
World Wildlife Fund The World Wide Fund for Nature Inc. (WWF) is an international non-governmental organization founded in 1961 that works in the field of wilderness preservation and the reduction of human impact on the environment. It was formerly named the W ...
found that 60% of biodiversity loss can be attributed to the vast scale of feed crop cultivation needed to rear tens of billions of farm animals. Livestock is also responsible for at least 20% of the world's
greenhouse gas emissions Greenhouse gas emissions from human activities strengthen the greenhouse effect, contributing to climate change. Most is carbon dioxide from burning fossil fuels: coal, oil, and natural gas. The largest emitters include coal in China and ...
, which are the main cause of the current climate change. This is due to feed production, enteric fermentation from ruminants, manure storage and processing, and transportation of animal products. The greenhouse gas emissions from livestock production greatly exceeds the greenhouse gas emissions of any other human activity. Some authors argue that by far the best thing we can do to slow climate change is a global shift towards a vegetarian or vegan diet. A 2017 study published in the journal '' Carbon Balance and Management'' found animal agriculture's global
methane emissions Increasing methane emissions are a major contributor to the rising concentration of greenhouse gases in Earth's atmosphere, and are responsible for up to one-third of near-term global heating. During 2019, about 60% (360 million tons) of methane r ...
are 11% higher than previously estimated. In November 2017, 15,364 world scientists signed a warning to humanity calling for, among other things, "promoting dietary shifts towards mostly plant-based foods." A 2019 report in ''
The Lancet ''The Lancet'' is a weekly peer-reviewed general medical journal and one of the oldest of its kind. It is also the world's highest-impact academic journal. It was founded in England in 1823. The journal publishes original research articles ...
'' recommended that global meat consumption be reduced by 50 percent to mitigate climate change. Many developing countries, including China and India, are moving away from traditional plant-based diets to meat-intensive diets as the result of modernization and
globalization Globalization, or globalisation (Commonwealth English; see spelling differences), is the process of interaction and integration among people, companies, and governments worldwide. The term ''globalization'' first appeared in the early 20t ...
, which has facilitated the spread of Western consumer cultures around the world. Around 166 to over 200 billion land and aquatic animals are consumed by the global population of over 7 billion every year, and meat consumption is projected to more than double by 2050 as the population grows to over 9 billion. A 2018 study published in ''
Science Science is a systematic endeavor that builds and organizes knowledge in the form of testable explanations and predictions about the universe. Science may be as old as the human species, and some of the earliest archeological evidence ...
'' states that meat consumption could rise by as much as 76% by 2050 as the result of human population growth and rising affluence, which will increase greenhouse gas emissions and further reduce biodiversity.
David Attenborough Sir David Frederick Attenborough (; born 8 May 1926) is an English broadcaster, biologist, natural historian and author. He is best known for writing and presenting, in conjunction with the BBC Natural History Unit, the nine natural histo ...
warned in 2020 that "the planet can't support billions of meat-eaters." Animals that feed on grain or rely on grazing require more water than grain crops. Producing of meat requires up to 15,000 liters of water. According to the
United States Department of Agriculture The United States Department of Agriculture (USDA) is the federal executive department responsible for developing and executing federal laws related to farming, forestry, rural economic development, and food. It aims to meet the needs of comme ...
(USDA), growing crops for farm animals requires nearly half of the US water supply and 80% of its agricultural land. Animals raised for food in the US consume 90% of the soy crop, 80% of the corn crop, and 70% of its grain. However, where an
extensive farming Extensive farming or extensive agriculture (as opposed to intensive farming) is an Agriculture production system that uses small inputs of labour, fertilizers, and capital, relative to the land area being farmed. Systems Extensive farming is ...
system (as opposed to a feedlot) is used, some water and nutrients are returned to the soil to provide a benefit to the pasture. This cycling and processing of water and nutrients is less prevalent in most plant production systems, so may bring the efficiency rate of animal production closer to the efficiency of plant based agricultural systems. In tracking food animal production from the feed through to the dinner table, the inefficiencies of meat,
milk Milk is a white liquid food produced by the mammary glands of mammals. It is the primary source of nutrition for young mammals (including breastfed human infants) before they are able to digest solid food. Immune factors and immune-modulat ...
, and egg production range from a 4:1 energy input to protein output ratio up to 54:1. The result is that producing animal-based food is typically much less efficient than the harvesting of grains, vegetables,
legume A legume () is a plant in the family Fabaceae (or Leguminosae), or the fruit or seed of such a plant. When used as a dry grain, the seed is also called a pulse. Legumes are grown agriculturally, primarily for human consumption, for livestock for ...
s, seeds, and fruits. There are also environmentalist arguments in favor of the morality of eating meat. One such line of argument holds that sentience and individual welfare are less important to morality than the greater ecological good. Following environmentalist
Aldo Leopold Aldo Leopold (January 11, 1887 – April 21, 1948) was an American writer, philosopher, naturalist, scientist, ecologist, forester, conservationist, and environmentalist. He was a professor at the University of Wisconsin and is best known for his ...
's principle that the sole criterion for morality is preserving the "integrity, stability and beauty of the biotic community", this position asserts that sustainable hunting and animal agriculture are environmentally healthy and therefore good. Jay Bost, an agroecologist and winner of ''
The New York Times ''The New York Times'' (''the Times'', ''NYT'', or the Gray Lady) is a daily newspaper based in New York City with a worldwide readership reported in 2020 to comprise a declining 840,000 paid print subscribers, and a growing 6 million paid ...
'' essay contest on the ethics of eating meat, supports meat consumption, arguing that "eating meat raised in specific circumstances is ethical; eating meat raised in other circumstances is unethical" in regard to environmental usage. He proposes that if "ethical is defined as living in the most ecologically benign way, then in fairly specific circumstances, of which each eater must educate himself, eating meat is ethical." The specific circumstances he mentions include using animals to cycle nutrients and convert sun to food.


Religious traditions of eating meat

Hinduism Hinduism () is an Indian religion or '' dharma'', a religious and universal order or way of life by which followers abide. As a religion, it is the world's third-largest, with over 1.2–1.35 billion followers, or 15–16% of the global p ...
holds vegetarianism as an ideal for three reasons: the principle of
nonviolence Nonviolence is the personal practice of not causing harm to others under any condition. It may come from the belief that hurting people, animals and/or the environment is unnecessary to achieve an outcome and it may refer to a general philosoph ...
(
ahimsa Ahimsa (, IAST: ''ahiṃsā'', ) is the ancient Indian principle of nonviolence which applies to all living beings. It is a key virtue in most Indian religions: Jainism, Buddhism, and Hinduism.Bajpai, Shiva (2011). The History of India � ...
) applied to animals; the intention to offer only "pure" (vegetarian) or sattvic food to a deity and then to receive it back as
prasad 200px, Prasad thaal offered to Swaminarayan temple in Ahmedabad ">Shri Swaminarayan Mandir, Ahmedabad">Swaminarayan temple in Ahmedabad Prasada (, Sanskrit: प्रसाद, ), Prasadam or Prasad is a religious offering in Hinduism. Most o ...
; and the conviction that an insentient diet is beneficial for a healthy body and mind and that non-vegetarian food is detrimental for the mind and for spiritual development.
Buddhist Buddhism ( , ), also known as Buddha Dharma and Dharmavinaya (), is an Indian religion or philosophical tradition based on teachings attributed to the Buddha. It originated in northern India as a -movement in the 5th century BCE, and ...
vegetarianism has similar strictures against hurting animals. The actual practices of Hindus and Buddhists vary according to their community and according to regional traditions.
Jains Jainism ( ), also known as Jain Dharma, is an Indian religion. Jainism traces its spiritual ideas and history through the succession of twenty-four tirthankaras (supreme preachers of ''Dharma''), with the first in the current time cycle being ...
are especially rigorous about not harming sentient organisms.
Islamic Law Sharia (; ar, شريعة, sharīʿa ) is a body of religious law that forms a part of the Islamic tradition. It is derived from the religious precepts of Islam and is based on the sacred scriptures of Islam, particularly the Quran and the ...
and
Judaism Judaism ( he, ''Yahăḏūṯ'') is an Abrahamic, monotheistic, and ethnic religion comprising the collective religious, cultural, and legal tradition and civilization of the Jewish people. It has its roots as an organized religion in th ...
have dietary guidelines called
Halal ''Halal'' (; ar, حلال, ) is an Arabic word that translates to "permissible" in English. In the Quran, the word ''halal'' is contrasted with '' haram'' (forbidden). This binary opposition was elaborated into a more complex classification k ...
and
Kashrut (also or , ) is a set of dietary laws dealing with the foods that Jewish people are permitted to eat and how those foods must be prepared according to Jewish law. Food that may be consumed is deemed kosher ( in English, yi, כּשר), fr ...
, respectively. In Judaism, meat that may be consumed according to ''
halakha ''Halakha'' (; he, הֲלָכָה, ), also transliterated as ''halacha'', ''halakhah'', and ''halocho'' ( ), is the collective body of Jewish religious laws which is derived from the written and Oral Torah. Halakha is based on biblical commandm ...
'' (Jewish law) is termed ''
kosher (also or , ) is a set of dietary laws dealing with the foods that Jewish people are permitted to eat and how those foods must be prepared according to Jewish law. Food that may be consumed is deemed kosher ( in English, yi, כּשר), fro ...
''; meat that is not compliant with Jewish law is called ''
treif (also or , ) is a set of dietary laws dealing with the foods that Jewish people are permitted to eat and how those foods must be prepared according to Jewish law. Food that may be consumed is deemed kosher ( in English, yi, כּשר), fro ...
''. Causing unnecessary pain to animals is prohibited by the principle of tza'ar ba'alei chayim. While it is neither required nor prohibited for Jews to eat meat, a number of medieval scholars of Judaism, such as Joseph Albo and Isaac Arama, regard
vegetarianism Vegetarianism is the practice of abstaining from the consumption of meat (red meat, poultry, seafood, insects, and the flesh of any other animal). It may also include abstaining from eating all by-products of animal slaughter. Vegetarianis ...
as a moral ideal. Similarly,
Islamic dietary laws Islamic dietary laws are dietary laws that Muslims follow. Islamic jurisprudence specifies which foods are '' '' (, "lawful") and which are '' '' (, "unlawful"). The dietary laws are found in the Quran, the holy book of Islam, as well as in col ...
permit the consumption of certain animals at the condition that their meat is not obtained through prohibited methods of slaughtering (ex: strangling, beaten to death, etc.), along with adherence to other restrictions. Meat obtained through prohibited methods of slaughtering is considered
haram ''Haram'' (; ar, حَرَام, , ) is an Arabic term meaning 'Forbidden'. This may refer to either something sacred to which access is not allowed to the people who are not in a state of purity or who are not initiated into the sacred knowle ...
. In
Christianity Christianity is an Abrahamic monotheistic religion based on the life and teachings of Jesus of Nazareth. It is the world's largest and most widespread religion with roughly 2.38 billion followers representing one-third of the global popula ...
as practised by members of
Eastern Orthodox Church The Eastern Orthodox Church, also called the Orthodox Church, is the second-largest Christian church, with approximately 220 million baptized members. It operates as a communion of autocephalous churches, each governed by its bishops via ...
,
Roman Catholic Church The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.3 billion baptized Catholics worldwide . It is among the world's oldest and largest international institutions, and has played a ...
,
Greek Catholic Church The term Greek Catholic Church can refer to a number of Eastern Catholic Churches following the Byzantine (Greek) liturgy, considered collectively or individually. The terms Greek Catholic, Greek Catholic church or Byzantine Catholic, Byzantine Ca ...
, and others, it is prohibited to eat meat in times of
fasting Fasting is the abstention from eating and sometimes drinking. From a purely physiological context, "fasting" may refer to the metabolic status of a person who has not eaten overnight (see " Breakfast"), or to the metabolic state achieved after ...
. Rules of fasting also vary. There are also Christian monastic orders that practice vegetarianism.
Shinto Shinto () is a religion from Japan. Classified as an East Asian religion by scholars of religion, its practitioners often regard it as Japan's indigenous religion and as a nature religion. Scholars sometimes call its practitioners ''Shint ...
has a concept of kegare, which means a state of pollution and defilement, and traditionally eating animals is thought to be one of them. Eating animals having more legs is thought to be worse. (Eating mammals is worse than eating chickens or fish.) This concept leads to discrimination against slaughtermen and people who work with leather, who are called burakumin.
Shinran ''Popular Buddhism in Japan: Shin Buddhist Religion & Culture'' by Esben Andreasen, pp. 13, 14, 15, 17. University of Hawaii Press 1998, was a Japanese Buddhist monk, who was born in Hino (now a part of Fushimi, Kyoto) at the turbulent close o ...
, the founder of the Buddhist sect
Jōdo Shinshū , also known as Shin Buddhism or True Pure Land Buddhism, is a school of Pure Land Buddhism. It was founded by the former Tendai Japanese monk Shinran. Shin Buddhism is the most widely practiced branch of Buddhism in Japan. History Shinran ...
, taught that lower class who had to kill beings could enter
nirvana ( , , ; sa, निर्वाण} ''nirvāṇa'' ; Pali: ''nibbāna''; Prakrit: ''ṇivvāṇa''; literally, "blown out", as in an oil lamp Richard Gombrich, ''Theravada Buddhism: A Social History from Ancient Benāres to Modern Colomb ...
even though killing animals was thought to be immoral.


Personhood

It has been argued by a number of modern philosophers that a moral community requires all participants to be able to make moral decisions, but animals are incapable of making moral choices (e.g., a tiger would not refrain from eating a human because it was morally wrong; it would decide whether to attack based on its survival needs, as dictated by hunger). Thus, some opponents of ethical vegetarianism argue that the analogy between killing animals and killing people is misleading. For example, Hsiao (2015) compares the moral severity of harming animals to that of picking a flower or introducing
malware Malware (a portmanteau for ''malicious software'') is any software intentionally designed to cause disruption to a computer, server, client, or computer network, leak private information, gain unauthorized access to information or systems, depr ...
into a computer. Others have argued that humans are capable of culture, innovation, and the sublimation of instinct in order to act in an ethical manner while animals are not, and so are unequal to humans on a moral level. This does not excuse cruelty, but it implies animals are not morally equivalent to humans and do not possess the rights a human has. The precise definition of a moral community is not simple, but Hsiao defines membership by the ability to know one's own good and that of other members, and to be able to grasp this in the abstract. He claims that non-human animals do not meet this standard.
Benjamin Franklin Benjamin Franklin ( April 17, 1790) was an American polymath who was active as a writer, scientist, inventor, statesman, diplomat, printer, publisher, and political philosopher. Encyclopædia Britannica, Wood, 2021 Among the leading int ...
describes his conversion to vegetarianism in chapter one of his autobiography, but then he describes why he (periodically) ceased vegetarianism in his later life:


Zoonotic diseases and antibiotic resistance

Opponents of eating meat argue that meat production foments
zoonotic diseases A zoonosis (; plural zoonoses) or zoonotic disease is an infectious disease of humans caused by a pathogen (an infectious agent, such as a bacterium, virus, parasite or prion) that has jumped from a non-human (usually a vertebrate) to a ...
, leading to increased pandemics, a claim backed up by a 2020 United Nations report. A 2017 paper stated that "An estimated 60% of known infectious diseases and up to 75% of new or emerging infectious diseases are zoonotic in origin" and that "It is estimated that zoonoses are responsible for 2.5 billion cases of human illness and 2.7 million human deaths worldwide each year". Meat production often involves the usage of antibiotics on livestock, fueling
antibiotic resistance Antimicrobial resistance (AMR) occurs when microbes evolve mechanisms that protect them from the effects of antimicrobials. All classes of microbes can evolve resistance. Fungi evolve antifungal resistance. Viruses evolve antiviral resistance. ...
. Antibiotic resistance has been argued to be as big of a threat as climate change. Critics of this line of reasoning state that while widespread adoption of vegan diets would reduce the fomenting of zoonotic diseases, antibiotic resistance, and pandemics, vegan food production still often involves antibiotics and does not eliminate these problems altogether.


Animals killed in crop harvesting

Steven Davis, a professor of
animal science Animal science is described as "studying the biology of animals that are under the control of humankind". It can also be described as the production and management of farm animals. Historically, the degree was called animal husbandry and the ...
at
Oregon State University Oregon State University (OSU) is a public land-grant, research university in Corvallis, Oregon. OSU offers more than 200 undergraduate-degree programs along with a variety of graduate and doctoral degrees. It has the 10th largest engineering ...
, argues that the least harm principle does not require giving up all meat. Davis states that a diet containing beef from grass-fed ruminants such as cattle would kill fewer animals than a vegetarian diet, particularly when one takes into account animals killed by agriculture. This conclusion has been criticized by Jason Gaverick Matheny (founder of ''in vitro'' meat organization New Harvest) because it calculates the number of animals killed per acre (instead of per consumer). Matheny says that, when the numbers are adjusted, Davis' argument shows
veganism Veganism is the practice of abstaining from the use of animal product—particularly in diet (nutrition), diet—and an associated philosophy that rejects the commodity status of animals. An individual who follows the diet or philosophy is kn ...
as perpetrating the least harm. Davis' argument has also been criticized by Andy Lamey for being based on only two studies that may not represent commercial agricultural practices. When differentiating between animals killed by farm machinery and those killed by other animals, he says that the studies again show veganism to do the "least harm". Christopher Bobier argues that arguments against the consumption of factory-farmed meat can also apply to vegetables produced under factory conditions due to animals killed in the production process (arguing that alternative sources of vegetables mean factory-produced vegetables are not necessary) and thus does not represent a prima-facie argument for vegetarianism.


Non-meat products

One of the main differences between a vegan and a typical vegetarian diet is the avoidance of both eggs and dairy products such as milk, cheese, butter, and yogurt. Ethical vegans do not consume dairy or eggs because of the exploitation and slaughter of animals in the dairy and egg industries and because of the environmental effect of dairy production. To produce milk from
dairy cattle Dairy cattle (also called dairy cows) are cattle bred for the ability to produce large quantities of milk, from which dairy products are made. Dairy cattle generally are of the species '' Bos taurus''. Historically, little distinction was ...
, most calves are separated from their mothers soon after birth and fed milk replacement in order to retain the cows' milk for human consumption. Animal welfare advocates point out that this breaks the natural bond between the mother and her calf. Unwanted male calves are either slaughtered at birth or sent for veal production. To prolong
lactation Lactation describes the secretion of milk from the mammary glands and the period of time that a mother lactates to feed her young. The process naturally occurs with all sexually mature female mammals, although it may predate mammals. The proces ...
, dairy cows are almost permanently kept pregnant through
artificial insemination Artificial insemination is the deliberate introduction of sperm into a female's cervix or uterine cavity for the purpose of achieving a pregnancy through in vivo fertilization by means other than sexual intercourse. It is a fertility treatment ...
. Although cows' natural life expectancy is about twenty years, after about five years the cows' milk production has dropped; they are then considered "spent" and are sent to slaughter for meat and
leather Leather is a strong, flexible and durable material obtained from the tanning, or chemical treatment, of animal skins and hides to prevent decay. The most common leathers come from cattle, sheep, goats, equine animals, buffalo, pigs and hog ...
.
Battery cage Battery cages are a housing system used for various animal production methods, but primarily for egg-laying hens. The name arises from the arrangement of rows and columns of identical cages connected together, in a unit, as in an artillery batt ...
s are the predominant form of housing for laying hens worldwide; these cages reduce aggression and cannibalism among hens, but are barren, restrict movement, and increase rates of
osteoporosis Osteoporosis is a systemic skeletal disorder characterized by low bone mass, micro-architectural deterioration of bone tissue leading to bone fragility, and consequent increase in fracture risk. It is the most common reason for a broken bone a ...
. In these systems and in free-range egg production, unwanted male chicks are culled and killed at birth during the process of securing a further generation of egg-laying hens. It is estimated that an average consumer of eggs who eats 200 eggs per year for 70 years of his or her life is responsible for the deaths of 140 birds, and that an average consumer of milk who drinks per year for 70 years is responsible for the deaths of 2.5 cows.


See also

*
Animal–industrial complex The term animal–industrial complex (AIC) refers to the systematic and institutionalized exploitation of animals. It includes every economic activity involving animals, such as the food industry (e.g., meat, dairy, poultry, apiculture), anim ...
*
Cultured meat Cultured meat (also known by other names) is meat produced by culturing animal cells ''in vitro''. It is a form of cellular agriculture. Cultured meat is produced using tissue engineering techniques pioneered in regenerative medicine. Jason M ...
* '' Devour the Earth'' *
Economic vegetarianism An economic vegetarian is a person who practices vegetarianism from either the philosophical viewpoint that the consumption of meat is expensive, part of a conscious simple living strategy or just because of necessity. In the developing world, wher ...
*
Ethical omnivorism Ethical omnivorism,Ronald L. Sandler (2014). ''Food Ethics: The Basics''. Routledge. p. 74. omnivorism or compassionate carnivorism, (as opposed to obligatory carnivorism, the view that it is obligatory for people to eat animals) is a human diet inv ...
*
Ethics of uncertain sentience The ethics of uncertain sentience refers to questions surrounding the treatment of and moral obligations towards individuals whose sentience—the capacity to subjectively sense and feel—and resulting ability to experience pain is uncertain; ...
*
Hard problem of consciousness The hard problem of consciousness is the problem of explaining why and how humans have qualia or phenomenal experiences. This is in contrast to the "easy problems" of explaining the physical systems that give us and other animals the ability to ...
*
Moral agency Moral agency is an individual's ability to make moral choices based on some notion of right and wrong and to be held accountable for these actions. A moral agent is "a being who is capable of acting with reference to right and wrong." Develop ...
* Non-aggression principle * Psychology of eating meat *
Problem of other minds The problem of other minds is a philosophical problem traditionally stated as the following epistemological question: Given that I can only observe the behavior of others, how can I know that others have minds? The problem is that knowledge of ot ...
*
Replaceability argument The replaceability argument, or the logic of the larder, is a philosophical argument that has been used to reject vegetarianism. It holds that consuming nonhuman animal products is good for animals because if they were not consumed, fewer animals ...
*
Sustainable diet Sustainable diets are defined as "those diets with low environmental impacts that contribute to food and nutritional security and to healthy lives for present and future generations. Sustainable diets are protective and respectful of biodiversity a ...


References


External links


A Dissertation on the Voluntary Eating of Blood: An 18th-century justification of the eating of meat. Rare WZ 260 D626 1745
Digitized copy hosted by the UCLA Digital Library. *
The moral basis of vegetarianism
' (1959) e-book by
Mahatma Gandhi Mohandas Karamchand Gandhi (; ; 2 October 1869 – 30 January 1948), popularly known as Mahatma Gandhi, was an Indian lawyer, anti-colonial nationalist Quote: "... marks Gandhi as a hybrid cosmopolitan figure who transformed ... anti- ...

The Ethics of Diet: A Catena of Authorities Deprecatory of the Practice of Flesh-Eating
by Howard Williams M.A. (1837–1931) {{Animal rights, topics Animal rights Cruelty to animals Ethical consumerism Issues in animal ethics