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Below is a partial but by no means conclusive history of some of the most significant milestones regarding public awareness of the environmental impacts of animal production and consumption. This list includes some of the growing scientific consensus as well as important cultural moments.

For many centuries, "Eastern religions like Hinduism, Jainism, and Buddhism have advocated eschewing animals and animal products in some format because of the belief systems centered around nonviolence." (Thrillist)

In 1976 the Vegan Society makes their case for veganism on the BBC series Open Door, including many facts about the unsustainable nature of animal agriculture and the better efficiency of plant-based eating.

  • 380 BC - Plato's Republic: Socrates tells Glaucon that meat production necessitates large amounts of pasture and inevitably results in war.

  • 1813 - In A Vindication of Natural Diet, Percy Shelley laments "the monopolizing meat eater of animal flesh," adding: "The most fertile districts of the habitable globe are now actually cultivated by men for animals, at a delay and waste of ailment absolutely incapable of calculation."

  • 1930s - The plant-based Ital diet, stemming from the word "vital," is developed by Rastafarians in Jamaica "as a way to emphasize the oneness and unity of life. Ital food promotes a healthy mind, body, spirit, and environment."

Hip-hop legend KRS-One rapping in 1990 about the consequences of beef production and consumption, stating in part, "This is another public service announcement / You can believe it, or you can doubt it."

In 1991 KCET, the Los Angeles PBS affiliate, produced a film documentary based on the book Diet for a New America called Diet for a New America: Your Health, Your Planet. The environmental issues begin 34 minutes in.

A short edit of the 2014 film "Cowspiracy - The Sustainability Secret." See the full version on Netflix. 

  • 1944 - The word "vegan" is coined and the Vegan Society is formed in England. In 1979, the definition is updated to mention that veganism is "for the benefit of humans, animals and the environment."

  • 1964 - In Proteins: Their Chemistry and Politics, Dr. Aaron M. Altschul points out that meat requires around 25 times as much water per pound as vegetables, with farming animals providing the smallest yield of protein. (We repeat, smallest yield of protein.)

  • 1971 - In Diet for a Small Planet, Frances Moore Lappe calls grain-fed cattle "reverse protein factories" because they require many more pounds of plant protein to produce a pound of flesh or fluids.

  • 1976 - As summarized on our blog, the Vegan Society makes their case for veganism on the BBC series Open Door, including many facts about the unsustainable nature of animal agriculture and the better efficiency of plant-based eating. Erika Cook declares, "A vegan culture is a tree culture."

  • 1987 - The bestselling book Diet for a New America by John Robbins further raises awareness of the environmental impacts of animal agriculture. The LA PBS affiliate airs a documentary based on the book. (See video.)

  • 1990 - KRS-One releases the song "Beef" about the horrors of meat production and consumption, including antibiotic use. (See video.)

  • 2004 - Agricultural scientists with the International Water Management Institute (IWMI) issue a report finding that governments may have to persuade people to eat less meat because of increasing demands on water supplies. "Western diets, which depend largely on meat, are already putting great pressures on the environment," requiring 2.5 to 5 times more water than the largely plant-based diets of developing countries.

  • 2006 - The Food and Agriculture Organization of the United Nations (UN FAO) releases the report Livestock's Long Shadow, finding the "livestock" sector is one of the top two or three most significant contributors to the most serious environmental problems at every scale from local to global.

  • 2006 - The World Conservation Union’s Red List of Threatened Species reports that most of the world’s threatened species are experiencing habitat loss as a result of "livestock" production.

  • 2006 - Published research in the journal Science extrapolates that there may soon be no more so-called commercial fish stocks left in the sea, with the last due to be lost by 2048.

  • 2006 - Center for Science in the Public Interest releases Six Arguments for a Greener Diet, "a meticulously researched examination of scientific studies" finding that, among other benefits including health, a plant-rich diet "leads to much less food poisoning, water pollution, air pollution, global warming, and animal suffering."

  • 2009 - Nestle executives release a secret report (not leaked until 2016) warning U.S. officials that the world is on a catastrophic course with freshwater scarcity caused in part by Western meat-eating.

  • 2010 - The U.S. Food and Drug Administration, U.S. Department of Agriculture, and the CDC all testify before Congress that there is a connection between the routine use of antibiotics for meat production and the declining effectiveness of antibiotics for people. In 2012, the FDA stated that the most significant source of human antimicrobial resistance is the meat industry.

  • 2012 - Stockholm International Water Institute (SIWI) releases a report finding that global diets will need to be at least 95% vegan by 2050 to avoid catastrophic water shortages caused by food production.

  • 2014 - The film Cowspiracy: The Sustainability Secret is released and soon reaches a massive audience via Netflix. Awareness of these issues rapidly grow and a larger conversation begins.

  • 2015 - The cover story of the June issue of Chemical & Engineering News is The Vegetable Solution, including facts such as: “A switch to plant proteins by those who can afford meat would go a long way to feeding the growing global population while using fewer of the planet’s resources.”

  • 2016 - Research published in the journal Nature Communications finds that vegan diets have the best land use and are the only way to feed the global population by 2050 without another tree being felled. Research published in the journal Elementa echoes this, also finding that vegan diets have the lowest land use requirement, and would also have the best carrying capacity if not for the current status quo of livestock-heavy land use. (Note: this study was completely distorted by media coverage.)

  • 2016 - Oxford University researchers determine a vegan shift would slash food-related emissions by 70% while annually averting 8.1 million human deaths and saving $1 trillion on healthcare.

  • 2016 - The FAIRR initiative – consisting of 40 investors managing $1.25 trillion in assets – launch a campaign urging global food companies to diversify to plant-based proteins to help to reduce the environmental impacts and health risks of animal production and consumption.

  • 2016 - The World Resources Institute publish the report Shifting Diets for a Sustainable Food Future, Installment 11 of which “shows that for people who consume high amounts of meat and dairy, shifting to diets with a greater share of plant-based foods could significantly reduce agriculture’s pressure on the environment.”

  • 2016 - A study published in Food Policy examining the concept of “ecological leftovers” for livestock production – meaning limiting livestock production to pasture and human inedible crop by-products – finds “the production of these diets still results in environmental impacts that cause several planetary boundaries to be transgressed. Meat consumption is drastically reduced in all diets.”

  • 2017 - University of Edinburgh researchers find that animal farming is the leading driver of food waste, responsible for the most losses of all harvested crops on Earth (40%) due to secondary consumption.

  • 2017 - A 2-year study citing 300 sources debunks the unsubstantiated claim that grazing domesticated animals is beneficial for the environment. "In other words, grazing livestock – even in a best-case scenario – are net contributors to the climate problem, as are all livestock."

  • 2017 - More than 15,000 scientists sign off on the fact that a shift to mostly plant-based diets is an effective step to transition to sustainability in the BioScience document World Scientists' Warning to Humanity: A Second Notice.

  • 2017 - TRUE, an EU-funded project, "has found evidence that switching diets towards plants as sources of protein as opposed to meat, is much more sustainable." (Summary)

  • 2017 - Following an explosion in popularity in recent years, vegan food is predicted by several companies to be the top food trend for 2018. Forbes Magazine publishes an extensive compilation of recent vegan and plant-based business successes, noting that vegan living is becoming "the norm" due in part to "its positive impact on sustainability," and urging business to go vegan or vegan-friendly because "The plant-based revolution is here to stay. Make sure you don’t get left behind."

  • March 2018 - Greenpeace issues a report calling for a drastic decrease in global meat and dairy production and consumption for healthier people and planet. Pete Smith, Former Convening Lead Author for the Intergovernmental Panel on Climate Change (IPCC), says, “The need to reduce demand for livestock products is now a scientifically mainstream view," adding that even producing those products more sustainably will not deliver the results needed.

  • March 2018 - Prospect Magazine, which aims to tackle the big challenges confronting society, declares: "Among environmentalists, food scientists, economists and others, a consensus has emerged: we have to change our diet—and change it in one respect in particular. There is simply not enough land or water on Earth to satisfy present, still less future, demands for meat, eggs and dairy products.

  • March 2018 - Research published in the Proceedings of the National Academy of Sciences find that a vegan shift would increase the US food supply by a third – eliminating all of the losses due to food waste and feeding all Americans plus roughly 390 million more. (Summary & chart)

  • May 2018 - A groundbreaking scientific assessment of all life on Earth reveals how we have turned our planet into a giant meat/milk/egg factory. In terms of biomass, farmed “poultry” make up 70% of all birds on the planet (vs. 30% wild) and “livestock” make up 60% of all mammals (vs. 36% human and 4% wild). The lead researcher tells the media, “Our dietary choices have a vast effect on the habitats of animals, plants and other organisms.” (Summary)

  • June 2018 - The first ever index to look at the "animal protein" sector through the lens of ESG (environmental, social and governance) issues finds that almost two-thirds of the largest animal meat, fish, and dairy companies are either not managing these risks or are failing to disclose basic information. The risks named include greenhouse gas (GHG) emissions, deforestation & biodiversity, water scarcity and use, waste and pollution, antibiotics, animal welfare, working conditions, and food safety. (Summary)

  • June 2018 - The most comprehensive analysis to date of the damage farming does to the planet, published in the journal Science, found that going vegan is the single biggest way to reduce your environmental impact on the planet. The lead researcher specifies, "Avoiding consumption of animal products delivers far better environmental benefits than trying to purchase sustainable meat and dairy.” (Summary)

  • July 2018 - Research from IATP and GRAIN shows that industrial livestock could eat up 80% of the world's entire carbon budget by 2050. (Summary)

  • July 2018 - Research published in the journal Science concludes: "Meat consumption is rising annually as human populations grow and affluence increases... which has major negative consequences for land and water use and environmental change... Changing meat consumption habits is a challenge that requires identifying the complex social factors associated with meat eating and developing policies for effective interventions." (Summary)

  • July 2018 - Research Published in Elementa, Science of the Anthropocene finds a plant-based shift is needed to feed the projected 2050 global population, stating "replacing most meat and dairy with plant-based alternatives, and greater acceptance of human-edible crops currently fed to animals, especially maize, as directly-consumed human food would be required." (Summary)

  • July 2018 - A Harvard study published in the journal Environmental Research Letters finds that shifting all beef production in the U.S. to pastured, grass-fed systems would require 30% more cattle, increase beef's methane emissions by 43%, and would require far more pasture than is available (in addition to causing other environmental harms). (Summary)

  • August 2018 - A peer-reviewed research article published in PLoS ONE finds the "[USDA] guidelines are unsustainable when it comes to land-intensive foods like meat." The paper, which asserts, "It is well known that there is not enough land for land-intensive diets such as those currently practiced in the United States to be applied globally," concludes a reduction in meat consumption in wealthy countries has tremendous potential for freeing up land. (Summary)

  • August 2018 - A report produced for the UN determines "societies have to go through a very dramatic shift over 20 to 30 years to get their emissions dramatically lower" and "it advocates that dairy and meat, which have a big climate impact, be replaced by largely plant-based diets." (Summary)

  • September 2018 - A study into the "water footprint" of diets in Western Europe, conducted by the European Commission and published in Nature Sustainability, finds that meat-free diets cut one’s water footprint by more than half. (Summary)

  • September 2018 - A report conducted by the Rural Investment Support for Europe (RISE) Foundation finds meat consumption has to be reduced by roughly half in order to come within a “safe operating space” for public health and the environment. The report’s authors tell the Guardian that harder messaging is needed, as the time has passed for “protecting the status quo” and “policymakers, farmers and society as a whole face deeply uncomfortable choices.” (Summary)

  • October 2018 - A report by the nonprofit Environmental Integrity Project finds three quarters of large U.S. meat processing plants that discharge their wastewater directly into streams and rivers violated their pollution control permits over the last two years, with some dumping as much nitrogen pollution as small cities – and facing little or no enforcement. Additionally, a single Illinois slaughterhouse was found to be the biggest nitrogen polluter of waterways in U.S. “Butchering so many animals under one roof is inherently messy — that’s no surprise — and that makes them very, very large sources of water pollution,” said Eric Schaeffer, director of Environmental Integrity Project. (Summary) (Summary 2)

  • October 2018 - A comprehensive IPCC assessment finds impacts of global warming will be far greater than expected unless major changed are made immediately, including a widespread dietary shift to eating less meat. (Summary)

  • October 2018 - The most comprehensive analysis yet of the food system’s impact on the environment, published in the journal Nature, finds that huge reductions in meat-eating are essential to avoid dangerous climate change. Professor Pete Smith comments to the media that “the evidence is now unequivocal – we need to change our diets if we are to have a sustainable future.” (Summary)

  • October 2018 - Changing Markets Foundation issues a report finding governments must put policies in place to reduce demand for animal products, which would significantly mitigate GHG emissions while liberating vast areas of land for carbon sinks and nature conservation. (Summary)

  • October 2018 - A study published in the journal Global Food Security shows that meat and dairy products are responsible for the lion’s share of greenhouse emissions from the EU diet, and reducing (ideally eliminating) them matters more than consuming locally. (Summary)

  • October 2018 - Research published in the Lancet finds that replacing animal-source foods with plant-based ones is particularly effective in high-income countries for improving nutrient levels, lowering premature mortality, and reducing some environmental impacts, in particular greenhouse gas emissions. (Summary)

  • October 2018 - Of the 2018 release of WWF's biennial Living Planet Report, which names Australia as the only nation in the developed world to make their global list of deforestation hotspots, WWF conservation scientist Dr Martin Taylor tells the media, "Most deforestation in Australia is just for livestock pasture." He elaborates: "Urban sprawl is a problem in the areas where it occurs but it's a drop in the ocean compared to the amount of forest destruction just to produce livestock for pasture." 

  • October 2018 - Research published in the journal ScienceDaily finds that, in terms of food-related emissions, eating plant-based foods is better for the planet than being a "localvore." (Summary)

  • November 2018 - An Oxford study published in the Public Library of Science (PLOS) calculates that many animal meat products would have to be taxed up to 167% in order to cover the resulting health system costs. The author of the study says, “Such a tax would show everyone that meat consumption ‘not only has an impact on personal health, but also entails costs for society and the environment." (Summary)

  • November 2018 - A study published in Climate Policy finds the so-called livestock sector could use almost half of the greenhouse gas emission budget allowed by 2030 and includes a three-step strategy to address this urgent issue. Dr. Helen Harwatt, farmed animal law and policy fellow at Harvard Law School, advises that getting protein from plant sources instead of animal sources would drastically help in meeting climate targets and reduce the risk of overshooting temperature goals. (Summary)

  • November 2018 - New Zealand Ecologist Mike Joy publishes the book Mountains to Sea: Solving New Zealand’s Freshwater Crisis, in which he says writes: “The prescription is clear for a viable future for New Zealand and for civilisation... we must significantly reduce animal agriculture, and de-intensify food-production systems." He points out "the inefficiency of producing protein-eating animals rather than plants," and says a plant-based shift "will give us multiple benefits – economically, for human health, animal welfare, resilience, the climate and much more.” (Excerpt)

  • November 2018 - Dinners organized by the Dutch Ministry of Education, Culture, and Science are now vegetarian by default. MP Christine Teunissen says, "The [Dutch] cabinet admitted as early as 2015 that meat and dairy are the two most environmentally damaging elements in our diet. I hope other ministries will follow this sustainable example."

  • November 2018 - The UK government's Committee on Climate Change releases a report finding that major reductions in high carbon foods such as beef, lamb, and dairy products, coupled with increased consumption of fruits, vegetables, pulses and legumes, are critical to critical to help reduce agricultural emissions. Per CNN, "The advisory body suggests that a dramatic reduction in the consumption of cow and sheep products could release up to 7 million hectares of grassland, which could instead be planted to create forests and help store carbon." (Summary)

  • December 2018 - IIASA-led research published in the journal Nature Climate Change has found that changing agricultural practices and a shift in diet away from meat and dairy products could reduce the sector’s emissions by up to 50% by 2050 compared to a situation without mitigation efforts. (Summary)

  • December 2018 - The Guardian explains "Why eating less meat is the best thing you can do for the planet in 2019."

  • January 2019 - The EAT-Lancet Commission on Food, Planet, Health brings together more than 30 world-leading scientists from across the globe to reach a scientific consensus that defines a healthy and sustainable diet, which they determine requires a 90% global reduction in meat-eating. Key findings: "A diet that includes more plant-based foods and fewer animal source foods is healthy, sustainable, and good for both people and planet." Also: "Foods sourced from animals, especially red meat, have relatively high environmental footprints per serving compared to other food groups. This has an impact on greenhouse gas emissions, land use and biodiversity loss." (Summary)

  • January 2019 - A commission report by scientific journal The Lancet following a three-year project led by 43 interdisciplinary experts from 14 countries concludes that beef and dairy subsidies should be scrapped and redirected to "sustainable farming for healthful food," adding that national dietary guidelines “could be extended to include sustainability by moving populations towards consuming largely plant-based diets." (Summary)

  • January 2019 - The FAIRR initiative – consisting of 40 investors managing $1.25 trillion in assets – release a letter urging global fast food brands to mitigate their environmental impacts (which threaten their own long-term sustainability), citing in particular the growing demand for plant-based food as an opportunity to do so. (Summary)

  • January 2019 - The World Economic Forum releases a report detailing the urgency of “integrating more plant-based protein alternatives into the world’s diet in order to significantly improve human health and environmental sustainability.” It determines the current global growth of meat consumption will be “incompatible with keeping global temperatures from rising more than 2 (let alone 1.5) degrees Celsius.” (Summary)

  • January 2019 - A report from the Humane Party determines that vegan-organic agriculture can be 4,198% more productive than animal-based agriculture in the amount of food produced per acre. (Summary)

  • January 2019 - Canada's latest food guide drops dairy and favors plant-based proteins, acknowledging that eating more plant and fewer animal-based foods can “help to conserve soil, water and air.” (Summary)

  • February 2019 - Greenpeace commissions a report finding that over 71% of all EU agricultural land is dedicated to feeding so-called livestock – including 63% of its arable land, which is being used to produce animal feed instead of food for people – and nearly a fifth of the EU's total budget goes to supporting animal farming, a trend which must be reversed. (Summary)

  • February 2019 - A climate change-focused report launched by a group of experts from an international consortium of research and policy institutes finds changes in lifestyles are not only inevitable, but would need to be radical, and start immediately, and one of their options "with large emission reduction potentials" includes "vegan-vegetarian diets." (Summary)

  • February 2019 - The UN's "Solve Different" campaign urges people to consider how plant-based food save water. It finds that a vegan burger uses 75 to 95 percent less water, causes 87 to 90 percent fewer emissions, and uses 93 to 95 percent less land than a beef burger. (Summary)

  • February 2019 - Agroecologist, political economist, lecturer and author Eric Holt Giménez releases the book "Can We Feed the World Without Destroying It?" calling for "reducing livestock production and meat consumption [to] refocus the grain industry toward producing human food, reduce greenhouse gas emissions, and allow farmers to diversify their crops." (Summary)

  • March 2019 - The world’s first comprehensive evidence-based assessment of land degradation and restoration, extensively peer-reviewed drawing on more than 3,000 scientific, government, indigenous and local knowledge sources and produced by the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES), calls for "shifts towards less land degrading diets, such as those with more plant-based foods and less animal protein from unsustainable sources, and reductions in food loss and waste." (Media release)

  • March 2019 - The World Wide Fund for Nature (formerly the World Wildlife Fund) and Knorr Foods launches a campaign and report identifying "50 foods we should eat more of because they are nutritious, have a lower impact on our planet than animal-based foods, can be affordable, accessible and taste good." The report calls "over-reliance on animal-based foods" a strain on our environment and a threat to food security, since "meat, dairy and egg production is more water, land and greenhouse gas intensive than plant production." (Summary)

  • March 2019 - The United Nations releases its sixth Global Environment Outlook (GEO) report, drawn up by 250 scientists and experts from more than 70 countries. It says: “Reducing overall meat consumption as well as providing alternatives to conventional livestock production (eg through plant-based meat alternatives) would substantially reduce the agricultural land-use footprint.” The report also urges that an emissions tax on food could be "transformative in reducing the greenhouse gases and loss of wildlife habitat linked to eating red meat," and finds that taking action to change worldwide food, energy, and waste management systems will prevent millions of premature deaths. (Summary)

  • March 2019 - A report by the Institute for Applied Ecology (Öko-Institut), commissioned by environmental umbrella organisation Climate-Alliance, finds Germany’s GHG reduction targets for 2030 in the agriculture sector cannot be reached without implementing measures to reduce so-called livestock. Team lead world nutrition at NGO Germanwatch Tobias Reichert calls for “significantly lower consumption of meat and milk must be accompanied by reduced export volumes and less discarded milk and meat products." (Summary)

  • March 2019 - A life-cycle analysis verified by the sustainability consulting group Quantis finds that compared to bovine-based burgers, the newest version of the vegan Impossible Burger has an 89% smaller carbon footprint, uses 87% less water and 96% less land, and cuts water contamination by 92%. (Summary)

  • March 2019 - Harvard Medical School and Harvard Health Publishing release an essay lauding plant-based protein, explaining that "the foods that are healthy for the climate almost completely overlap with the foods that are healthy for your physical well-being." Furthermore: "[F]ar and away the most destructive food is beef. In terms of all three markers — greenhouse gas emissions, freshwater consumption, and land use — beef is an environmental disaster. Just behind beef is dairy, followed by poultry, pork, eggs, and fish." 

  • March 2019 - The World Economic Forum states: "Global meat consumption is on the rise. Consequently, the populations of animals raised for meat production have increased, leading to an unavoidable boom in methane production."

  • April 2019 - A group of health experts meeting in Salt Lake City at the Forward Food Leadership Summit to discuss the physical and environmental impacts of meat-eating determine that the majority of Americans overeat protein and should be eating more plant-based foods for personal and planetary health. (Summary

  • August 2019 - Research published in Global Environmental Change finds, "Shifts toward plant-forward diets are essential for meeting climate change mitigation targets and remaining within planetary boundaries," noting that vegetarian (vs. vegan) diets typically include plenty of climate-damaging dairy products.

  • August 2019 - An IPCC report put together by more than 100 scientists from 52 countries, per TIME Magazine, "finds that if more of the world’s population shifts toward plant-based diets and reduces their meat consumption, it could significantly boost the planet’s ability to fight climate change." (Summary)

The future is now:

We must have in mind modifications which will transform natural plant materials into entirely new forms approaching, if not equaling or surpassing, animal proteins in suitability.
— Dr. Aaron M. Altschul, 1964
I’ve never tasted anything as realistic as Beyond Meat. The chicken strips look, feel, and taste closer to real meat than any other food I’ve ever eaten.
— Slate journalist Farhad Manjoo, 2012

The Facts

Gain a clear understanding of the various ways animal agriculture harms our planet. 

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The Myths

Challenge the narratives that downplay the negative impacts of animal production & vilify vegan diets.

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