Kiera Jefferson
Animal agriculture is the second-largest contributor to human-made greenhouse gas emissions, with cattle being the biggest source of emissions from animal agriculture. Livestock is responsible for the equivalent of about 502 million tonnes of carbon dioxide a year, mostly through the methane they release. In addition, animal agriculture is the leading cause of biodiversity loss, with over half of the world's endangered or threatened species suffering habitat loss due to livestock. With animal agriculture contributing significantly to climate change and environmental degradation, there is a growing focus on transitioning towards plant-based diets and reducing meat and dairy consumption to mitigate these negative impacts.
| Characteristics | Values |
|---|---|
| Animal agriculture's contribution to human-made GHG emissions | Second largest contributor after fossil fuels |
| Leading causes | Deforestation, water and air pollution, biodiversity loss |
| Proportion of Earth's land surface devoted to growing livestock | 1/3rd |
| Proportion of global freshwater devoted to growing livestock | 16% |
| Proportion of grain production used to feed livestock | 1/3rd |
| Livestock sector's contribution to annual global GHG emissions | 14.5% |
| Increase in methane and nitrous oxide emissions from livestock manure between 1961 and 2010 | 54% |
| EU farm animal emissions in 2018 | 502 million tonnes of carbon dioxide equivalent |
| EU farm animal emissions with indirect greenhouse gas emissions included | 704 million tonnes of carbon dioxide equivalent |
| Increase in EU meat and dairy production between 2007 and 2018 | 9.5% |
| Corresponding increase in annual emissions | 6% or 39 million tonnes |
| Percentage of Britain's overall greenhouse gas emissions from cows | 3% |
| Percentage of Britain's methane emissions from cows | 25-30% |
| Percentage of New Zealand's greenhouse gas emissions from livestock | 34% |
| Percentage of global species extinctions and loss of biodiversity attributed to animal agriculture | 100% |
| Percentage of land use changes on Earth related to livestock | >50% |
| Percentage of freshwater pollution in western countries traced back to animal agriculture | 70-90% |
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What You'll Learn
Livestock methane emissions
Livestock is a leading contributor to global methane emissions. According to the Food and Agriculture Organization of the United Nations (FAO), the livestock sector is responsible for nearly half of global anthropogenic methane production, with 32% coming directly from livestock systems. Cattle are the biggest source of emissions from animal agriculture, with beef consumption in the average American diet creating 1,984 pounds of CO2e annually.
Cows, goats, sheep, and several other animals are ruminants, meaning they have four stomachs and digest their food in their stomachs rather than their intestines like humans. The digestive process of ruminants, known as enteric fermentation, produces methane, a powerful greenhouse gas. This methane is expelled through burping and flatulence, contributing to global warming. A single cow produces between 154 and 264 pounds of methane per year, and with 1.5 billion cattle raised for meat production, this results in at least 231 billion pounds of methane released into the atmosphere annually.
The impact of livestock methane emissions is significant. In Britain, cows contribute 3% of overall greenhouse gas emissions and 25-30% of methane emissions. In New Zealand, a major cattle and sheep farming country, livestock accounts for 34% of greenhouse gas emissions. The extensive clearing of trees for agricultural expansion further exacerbates emissions, with "livestock-induced" emissions amounting to roughly 0.65 gigatons of CO2e per year.
Addressing livestock methane emissions is crucial for mitigating climate change. Greenpeace has called for an end to public subsidies for industrial-scale animal farming, and halving intensive animal farming could significantly reduce carbon dioxide emissions. Scientists are exploring various solutions, including dietary modifications such as adding garlic or seaweed to cow feed, breeding cows with improved digestive systems, and extracting methane from livestock waste. Transitioning to plant-based or lab-grown meat alternatives can also help reduce the need for animal farms and their associated emissions.
While efforts are being made to curb livestock methane emissions, it is a complex issue that requires further research and action to achieve significant reductions and meet climate goals.
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Animal agriculture's environmental impact
Animal agriculture is the second-largest contributor to human-made greenhouse gas emissions after fossil fuels. It is a leading cause of deforestation, water and air pollution, and biodiversity loss.
Cattle are the biggest source of emissions from animal agriculture. Beef consumption in an average American diet creates 1,984 pounds of CO2e annually. A 2013 report by the UN Food and Agriculture Organization (FAO) estimates that about 14.5% of global GHG emissions, or 7.1 gigatons of CO2 equivalent, can be attributed to the livestock sector annually. This is more than all transportation emissions combined, which account for 13% of global emissions.
Methane, a greenhouse gas 30 times more powerful than carbon dioxide, is produced by ruminant animals such as cows and sheep, which have bacteria in their four stomachs that aid in digestion. The complex digestion process causes them to belch methane. In Britain, cows contribute 3% of overall greenhouse gas emissions and 25-30% of methane emissions.
Animal agriculture also puts a strain on the Earth's finite land and water resources. It uses a significant amount of freshwater and is responsible for water pollution due to toxins and waste from the industry. Additionally, the crops used to feed livestock are treated with large amounts of fertilizers and pesticides, which run off into surrounding waterways.
To accommodate the 70 billion animals raised annually for human consumption, a third of the planet's ice-free land surface and nearly 16% of global freshwater are devoted to growing livestock. This contributes to deforestation, with about half of the world's habitable land used for meat production.
The environmental impact of animal agriculture is significant, and it is important to consider sustainable alternatives to reduce its effects on the planet.
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Cattle as the biggest source of emissions
Cattle are the biggest source of emissions from animal agriculture. A single cow can belch about 220 pounds of methane each year, which is 28 times more potent than carbon dioxide. In fact, over 90% of methane from cattle is emitted through burping. Cattle are responsible for 14.5% of global greenhouse gas emissions.
Cattle are also a leading cause of deforestation, water and air pollution, and biodiversity loss. To accommodate the 70 billion animals raised annually for human consumption, a third of the planet's ice-free land surface and nearly 16% of global freshwater are devoted to growing livestock. A third of worldwide grain production is used to feed livestock.
The livestock sector is estimated to contribute about 7.1 gigatons of CO2 equivalent annually. This figure is expected to increase as the global population nears 10 billion by 2050 and diets shift to incorporate more meat. Consumption of meat from ruminant animals like cattle is projected to increase by about 90% by 2050. If current trends continue, emissions from the food system alone could push global warming beyond 1.5°C, even if all non-food system emissions were eliminated.
To address these issues, efforts are being made to reduce methane emissions from cattle. For example, researchers are studying the impact of adding garlic to cow feed, which has been shown to reduce methane production. Other potential solutions include the use of methane-reducing feed additives, such as red seaweed (Asparagopsis taxiformis), and the selective breeding of low-methane cattle.
Additionally, halving intensive animal farming could significantly reduce carbon dioxide emissions. Policymakers are being urged to take action on livestock emissions to meet carbon reduction targets. Greenpeace, for instance, has called for an end to public subsidies for industrial-scale animal farming under the EU's common agricultural policy.
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EU farm animal emissions
Animal agriculture is the second-largest contributor to human-made greenhouse gas emissions after fossil fuels. It is also a leading cause of deforestation, water and air pollution, and biodiversity loss. To accommodate the 70 billion animals raised annually for human consumption, about a third of the planet's ice-free land surface and nearly 16% of global freshwater are devoted to growing livestock.
In the EU, farm animal emissions are a significant contributor to the region's total greenhouse gas emissions. According to a 2020 Greenpeace report, livestock on EU farms (including the UK) produced the equivalent of about 502 million tonnes of carbon dioxide in 2018, primarily through the methane they released. This figure rose to 704 million tonnes when indirect greenhouse gas emissions from deforestation and land use changes associated with growing animal feed were included. This increase in emissions is partly due to the rise in the EU's meat and dairy production, which grew by 9.5% between 2007 and 2018, resulting in a 6% increase in annual emissions, or about 39 million tonnes.
Greenhouse gas emissions from animal farming in the EU account for 17% of the EU's total emissions, surpassing emissions from all cars and vans combined (656 million tonnes of CO2 per year). This highlights the significant impact of animal farming on the EU's carbon footprint. To put it into perspective, a 50% reduction in animal farming would save the equivalent of 250 million tonnes of CO2, which is comparable to the combined emissions of the 11 lowest-emitting countries in Europe.
To address this issue, Greenpeace has called for an end to public subsidies for industrial-scale animal farming under the EU's common agricultural policy. However, this proposal may face resistance from powerful farming lobbies in large European countries. Policymakers are under pressure to demonstrate how they can meet the EU's climate targets, including the goal of reducing emissions by 55% by 2030 under the Paris Agreement, without implementing large-scale reforms to farming.
While there is a push to curb methane emissions from livestock, it is important to note that ruminant animals like cows, goats, and sheep have unique digestive systems that produce methane. Efforts to reduce methane production, such as adding garlic to cow feed, are being explored. However, the focus should also be on improving productivity, maintaining and enhancing carbon storage in grasslands, and producing more renewable energy to achieve carbon neutrality goals.
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Animal agriculture and biodiversity loss
Animal agriculture is the second largest contributor to human-made greenhouse gas emissions after fossil fuels. It is a leading cause of biodiversity loss, water and
The global food system is a major driver of climate change, accounting for about 30% of total human-made emissions. The current rate of biodiversity loss is unprecedented, with human consumption patterns causing the loss of 83% of all wild mammals and half of all plant species. Livestock numbers have soared due to animal agriculture, and farmed poultry now makes up 70% of all birds, while only 30% are wild.
Livestock production is a significant contributor to climate change, soil loss, water and nutrient pollution, and the decline of apex predators and wild herbivores. It puts pressure on ecosystems and biodiversity. A study published in 2019 warned that a quarter of the world's tropical land could be lost by the end of the century if meat and dairy consumption do not decrease significantly. Researchers found that increases in meat and milk production lead to sharp rises in land clearing in biodiverse regions.
To address biodiversity loss, dietary patterns must shift towards more plant-based options, reducing the demand for land and pressure on the environment. Protecting and setting aside more land for nature is also crucial, as the greatest gains for biodiversity will come from preserving or restoring entire ecosystems. Additionally, farming practices must become more nature-friendly and supportive of biodiversity.
While the focus is often on transitioning away from fossil fuels to combat climate change, animal agriculture is an often-overlooked contributor to environmental issues. By tackling livestock emissions and reducing the numbers of farm animals, we can significantly cut carbon dioxide emissions and work towards meeting climate targets.
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Frequently asked questions
Humans are the most environmentally destructive animal on Earth. Human activities have caused global warming, the extinction crisis, over-harvesting of land and sea, damaging resource extraction, pollution, overpopulation, and industry.
Human activities have led to the release of thousands of synthetic chemicals into the environment, altering the distribution of naturally occurring substances. These include toxic metals from activities such as animal agriculture, fossil fuels, mining, metal refining, and waste-water discharge.
Pollution can harm wildlife in two main ways: by affecting the quality of the environment or habitat in which they live, and by affecting the availability and quality of their food supply.
Acid rain can change the chemistry and quality of soils and water, making water bodies too acidic for some animals to survive. Air pollution can also damage the lung tissues of animals and reduce plant respiration by blocking openings in leaves.
There are ongoing federal programs in place, such as the Waters of the U.S. Rule and the Great Lakes Restoration Initiative, that aim to protect water quality and reduce nutrient runoff, which contributes to harmful algal blooms (HABs).
