Meat consumption affects the environment through greenhouse gas emissions, land demand, deforestation, water pollution, and biodiversity loss. The size of the impact varies by species and production system, but beef and lamb generally have the largest climate and land footprints. Beans, lentils, peas, tofu, and other plant proteins are usually much lower.
The Food and Agriculture Organization’s 2023 global assessment estimated that livestock agrifood systems—including meat, milk, and eggs—produced about 12% of human-caused greenhouse gas emissions in 2015. Demand is still rising: the OECD-FAO Agricultural Outlook 2026–2035 projects global meat consumption at about 412 million tonnes, measured in carcass-weight equivalent, by 2035. That is 12% above its 2023–2025 base period.
Key Takeaways
- Beef and lamb usually have the highest environmental impacts because ruminants produce methane and often require large areas of pasture and feed-producing land.
- What you eat usually matters more than how far it traveled. Local sourcing can support farmers and improve traceability, but it does not automatically make high-impact meat climate-friendly.
- Land use is central to the issue. Pasture expansion and crop production for animal feed can displace forests, grasslands, and wildlife habitat.
- Water figures need context. Rainwater, irrigation withdrawals, local water scarcity, and water pollution are different impacts and should not be collapsed into one dramatic number.
- The largest practical gains usually come from eating less beef and lamb, replacing some meals with plant proteins, and wasting less food. A person does not need to eliminate every animal product to reduce the footprint of their diet.
Why Meat’s Environmental Impact Is Still Growing
Global meat consumption has increased with population growth, urbanization, rising incomes, and changing diets. The latest OECD-FAO outlook expects consumption to keep growing through 2035, with poultry accounting for roughly two-thirds of the additional meat consumed. That matters because even lower-emission meats still require feed, land, energy, and manure management.
The environmental burden is not distributed evenly. Many high-income populations consume substantially more meat than lower-income populations, while livestock remains important for nutrition, income, transport, savings, and food security in many rural communities. Effective policy therefore has to distinguish excessive consumption from essential access rather than prescribe one identical diet for everyone.
Five Ways Meat Consumption Affects the Environment
1. Greenhouse Gas Emissions
Meat production releases several greenhouse gases across its life cycle. Cattle, sheep, and goats produce methane through enteric fermentation during digestion. Manure can release methane and nitrous oxide. Feed production, farm energy, processing, refrigeration, transport, and land-use change add carbon dioxide and other emissions.
These gases are commonly compared using carbon dioxide equivalents, or CO2e. The U.S. Environmental Protection Agency reports that methane has 27 to 30 times the warming impact of carbon dioxide over 100 years, while nitrous oxide has 273 times the impact. The exact comparison depends on the selected time horizon and whether climate-carbon feedbacks are included.
Ruminant meat is especially emissions-intensive because methane is produced throughout the animal’s life. That is why reducing beef and lamb consumption can be a high-leverage dietary step for people who want to act on climate change.
2. Land Use and Deforestation
Livestock needs land directly for grazing and indirectly for growing feed crops. Expanding pasture or cropland can replace forests, savannas, wetlands, and other ecosystems that store carbon and support wildlife.
In its global remote-sensing survey covering 2000–2018, the FAO found that livestock grazing accounted for 38.5% of deforestation, while cropland expansion accounted for almost 50%. Not all cropland expansion is connected to animal feed, but feed demand adds to competition for productive land.
Land conversion also compounds other causes of extinction by fragmenting habitats, altering fire patterns, and making ecosystems less resilient to climate change.
3. Water Use and Water Pollution
Livestock systems use water for animal drinking, cleaning, processing, and growing feed. However, a single “liters per kilogram” figure can be misleading because water-footprint studies may combine rainwater with irrigation water drawn from rivers, reservoirs, or aquifers. A liter of rainfall used on a pasture in a wet region is not equivalent to a liter pumped from a stressed watershed.
Water quality can be as important as water quantity. When manure or fertilizer is applied faster than crops can absorb its nutrients, nitrogen and phosphorus can move into surface water and groundwater. The EPA identifies manure runoff and discharges from animal feeding operations as important sources of nutrient pollution. Excess nutrients can fuel algal blooms, reduce oxygen in water, and harm aquatic life.
4. Biodiversity Loss and Soil Degradation
Habitat conversion for pasture and feed crops is the clearest biodiversity risk, but it is not the only one. Pesticide and fertilizer use, water pollution, invasive species, overgrazing, and climate change can also reduce ecosystem health. A UN Environment Programme-supported assessment identified agriculture as a threat to 24,000 of the 28,000 species then considered at risk of extinction.
The effects of grazing are context-specific. Poorly managed grazing can compact soil, remove vegetation, increase erosion, and damage streams. Well-managed grazing can maintain certain grassland habitats and support rural livelihoods. The relevant question is not simply whether animals graze, but where, at what stocking density, under which management system, and compared with what realistic alternative land use. That context is central to understanding why biodiversity matters to ecosystems.
5. Feed Demand and Resource Efficiency
Animals convert feed into meat with unavoidable energy losses. Pigs and poultry generally convert feed more efficiently than cattle and sheep, but their production still requires cropland, fertilizer, water, and energy. Ruminants can also eat grasses, crop residues, and by-products that people cannot digest, which is valuable in some farming systems. The environmental result depends on whether livestock uses existing grassland and waste streams or drives additional feed production and land conversion.
Food waste magnifies every upstream impact. Meat that is produced, refrigerated, transported, and then discarded carries a relatively large wasted footprint. Planning portions, freezing food promptly, and using leftovers can reduce demand without changing the nutritional composition of a meal.
Which Meat Has the Highest Environmental Impact?
Beef from dedicated beef herds has the highest average greenhouse gas footprint among common meats, followed by lamb and mutton. Beef produced as a co-product of dairy has a lower average footprint because some impacts are allocated to milk, but it remains more emissions-intensive than pork, poultry, tofu, or peas.
| Food | Approximate global-average emissions | Main drivers |
|---|---|---|
| Beef from dedicated beef herds | 99 kg CO2e per kg of food | Enteric methane, land use, feed, and manure |
| Lamb and mutton | 40 kg CO2e per kg | Enteric methane and land use |
| Beef from dairy herds | 33 kg CO2e per kg | Impacts shared between milk and meat |
| Pork | 12 kg CO2e per kg | Feed production, manure, and farm energy |
| Poultry | 10 kg CO2e per kg | Feed production, manure, and farm energy |
| Tofu | 3 kg CO2e per kg | Soy cultivation, processing, and energy |
| Peas | 1 kg CO2e per kg | Crop production and farm inputs |
Why Beef and Lamb Rank Highest
Cattle and sheep are ruminants, so they generate methane while digesting fibrous food. They also tend to need more land and take longer to reach slaughter weight than pigs or chickens. In some supply chains, pasture expansion or feed production adds substantial land-use-change emissions.
Production efficiency still matters: the footprint of the highest-impact producer can be many times larger than that of a lower-impact producer of the same food. Yet the broad ordering remains consistent across most life-cycle studies—beef and lamb are usually higher than pork and poultry, which are usually higher than legumes and soy-based foods.
Does the Production Method Matter?
Yes. Breed, feed quality, animal health, fertilizer use, manure management, energy source, land-use history, slaughter age, and processing efficiency can all change a product’s footprint. Better farming practices can reduce emissions and pollution within any production system.
Is Local Meat Better for the Environment?
Not automatically. For most food, production and land use create a larger share of emissions than transport. Buying local may improve freshness, traceability, and support for nearby farms, but a locally produced steak can still have a much larger footprint than a plant protein shipped by sea. Air-freighted food is an important exception because air transport is emissions-intensive.
Are Grass-Fed, Organic, or Free-Range Systems Lower-Impact?
Sometimes, but no label guarantees a lower total footprint. Grass-fed and free-range systems can improve animal welfare and may support soil health, on-farm biodiversity, or lower irrigation use in certain places. They often require more land, however, and slower-growing animals can emit more methane over their lifetimes.
A 2024 World Resources Institute review found frequent tradeoffs between climate, land use, water, antibiotic use, and animal welfare. Treat terms such as “local,” “regenerative,” “natural,” or “grass-fed” as descriptions that need evidence—not as complete environmental assessments. The distinction between organic and natural food labels is also important because they do not make the same claims.
How to Reduce the Environmental Impact of Eating Meat
The Intergovernmental Panel on Climate Change concludes that shifts toward sustainable, healthy diets have substantial climate-mitigation potential, although the appropriate diet varies by region, culture, health needs, and food access. These steps prioritize the changes that usually deliver the largest environmental gains:
- Reduce beef and lamb first. Replacing one high-impact ruminant meal usually saves more emissions and land than replacing the same amount of chicken or pork.
- Make plant proteins the default more often. Beans, lentils, chickpeas, peas, tofu, and tempeh can replace part or all of the meat in many meals.
- Use smaller portions of meat. Treat meat as one ingredient in a meal rather than the entire center of the plate.
- Prevent waste. Plan portions, refrigerate safely, freeze surplus food, and use leftovers.
- Ask for credible sourcing evidence. Useful indicators include supply-chain traceability, no-deforestation commitments, measured farm-level emissions, responsible manure management, and transparent animal-welfare standards.
- Keep the change realistic. A repeatable reduction is more useful than an all-or-nothing rule that does not fit your health, culture, budget, or food access.
Diet is only one part of environmental action. Energy, transport, housing, consumption, voting, and community decisions also matter. For a broader plan, see these practical ways to be an environmentalist.
Important Tradeoffs and Limits
- Livestock can be essential. In some communities, animals provide nutrient-dense food, income, manure, traction, savings, and a way to use land that cannot grow crops.
- Lower-carbon is not the same as lower-harm in every category. Switching from beef to chicken generally lowers climate and land impacts, but it can worsen animal-welfare outcomes because many more animals are required to provide the same amount of food.
- Plant foods are not impact-free. Irrigated crops can strain water supplies, fertilizer can pollute waterways, and commodity expansion can still drive habitat loss. The relevant comparison is between complete, realistic food systems.
- Global averages cannot certify an individual product. Farm-level data, land-use history, local water scarcity, and supply-chain traceability are needed for product-specific claims.
The Bottom Line
Meat consumption affects the environment most strongly through greenhouse gas emissions and land use, with additional effects on water, biodiversity, soil, and nutrient pollution. Beef and lamb generally have the largest footprints. Production improvements can reduce impacts, but they do not erase the large differences between food types.
For most people in high-consuming populations, the most effective dietary step is straightforward: eat less beef and lamb, replace some servings with legumes or soy foods, waste less, and demand better evidence for the meat that remains. That approach is more practical—and more scientifically defensible—than assuming that a single label or local source makes every product sustainable.
Sources and data links were reviewed on July 22, 2026. Environmental footprints are global averages and should not be treated as product-level certifications.
Frequently Asked Questions
How does meat consumption affect the environment?
Meat consumption drives demand for livestock production, which releases greenhouse gases, uses land and feed, can contribute to deforestation, and can pollute water through manure and fertilizer runoff. The scale of the impact depends on the animal and production system.
Which meat has the greatest environmental impact?
Beef from dedicated beef herds usually has the highest average greenhouse gas and land footprint, followed by lamb and mutton. Pork and poultry are generally lower than ruminant meat but higher than most legumes and soy foods.
Is local meat better for the environment?
Local meat is not automatically lower-impact. Production and land use usually create more emissions than transport, although local sourcing can improve traceability and support nearby farms. Air-freighted food is an important exception because air transport is highly emissions-intensive.
Is grass-fed beef more sustainable?
Grass-fed beef can improve animal welfare and may benefit soil, biodiversity, or water use in some locations, but it often requires more land and can produce more methane per unit of meat. Its overall impact depends on management, land-use history, stocking density, and the alternative use of the land.
How can I reduce the environmental impact of eating meat?
Prioritize eating less beef and lamb, replace some meals with beans, lentils, peas, tofu, or tempeh, use smaller meat portions, and prevent food waste. When buying meat, look for credible evidence on traceability, deforestation, emissions, manure management, and animal welfare.