Veganism, in the context of how food really works.
A well-chosen vegan diet can substantially reduce the environmental footprint of your food. Individual diets sit inside food systems, supply chains and communities, and further gains are possible when you also pay attention to waste, transport, packaging, and the people growing the food. This page connects the dots.
Food type and production usually matter more than transport distance. Poore & Nemecek's 2018 Science analysis covered more than 38,000 farms. A separate 2023 UK study by Scarborough and colleagues estimated vegan diets at about a quarter of high-meat diets' greenhouse impact. The size of a person's saving depends on their starting diet; comparisons with driving or flying depend on their travel habits.
For many foods, transport is a relatively small share of total emissions, though air freight can be important. A locally raised steak generally has a much higher footprint than tofu shipped by sea. 'Eat local' can support other goals, but climate comparisons should consider food type, production method, season and transport mode rather than distance alone.
Food is lost and wasted throughout the supply chain; UNEP estimated that 19% of food available to consumers was wasted in 2022, including inedible parts. This is not only a wealthy-country problem. Plan purchases, cool leftovers promptly and eat within two days or freeze, and learn 'use-it-up' recipes. Best-before dates concern quality, but never rely on smell or appearance to override a use-by date.
"The diet is the lever. Everything else compounds it."
Veganism is sometimes framed as individualist, but the most resilient food systems are collective — community gardens, food co-ops, dignity-led food banks, urban orchards, school gardens, allotments and seed libraries. Joining or supporting one builds the social fabric that makes plant-based eating normal rather than novel.
Sustainability also covers biodiversity, water, soil health, animal welfare and human rights. Plant-based diets can reduce several environmental pressures, but do not automatically improve every outcome. Consider where palm oil comes from, how water-intensive crops are grown in dry regions, and whether agricultural workers in supply chains such as cocoa and coffee are treated fairly.
Soy and oat milk generally have substantially lower per-litre greenhouse emissions and freshwater use than dairy milk, though reductions vary by product and measure. Soy milk usually has protein content closer to dairy than oat milk does; choose fortified versions.
Replacing a weekly beef meal with lentils can reduce food-related emissions. The saving depends on portion sizes and how the beef and lentils are produced; it cannot be equated to a flight without specifying the journey.
Where tap water is safe, choosing it instead of bottled water usually avoids packaging and lowers environmental impacts. The difference depends on bottling and transport; filters are only needed where appropriate, and savings vary.
Batch-cooking grains, beans and sauces can reduce repeated cooking and help use ingredients efficiently. Savings depend on the stove, batch size, storage and reheating; portion and chill food safely.
A full freezer is more efficient than an empty one and food waste in landfill is one of the fastest climate forcers we control at home.
Global averages across farms and supply chains. Lower is better; a kilogram of each food is not nutritionally equivalent.
kg CO₂-equivalent per kg
Poore & Nemecek, Science 2018, via Our World in Data
Modelled medians for 55,504 UK study participants, standardised to 2,000 kcal/day, age and gender; food only.
| Diet | kg CO₂e/day | Land (m²) | Water (L) |
|---|---|---|---|
| High meat-eater (>100g/d) | 10.2 | 16.78 | 890 |
| Medium meat-eater (50–100g/d) | 7.0 | 11.28 | 780 |
| Low meat-eater (<50g/d) | 5.4 | 8.31 | 710 |
| Fish-eater | 4.7 | 6.31 | 710 |
| Vegetarian | 4.2 | 6.01 | 530 |
| Vegan | 2.5 | 4.37 | 410 |
Source: Scarborough et al., Nature Food 2023.
Poore & Nemecek's 2018 analysis estimated that animal products used about 83% of farmland while supplying 18% of calories and 37% of protein. Its scenario without animal products reduced agricultural land use by about 75%, an area comparable to the US, China, the EU and Australia combined. Restoring suitable freed land could benefit nature, but would require deliberate policy and land management.
The global average total water footprint of beef is about 15,400 litres per kilo. This includes rainfall, surface and groundwater consumption, and a pollution-related component, so it is not equivalent to water from a shower. Pulses generally require less total water per gram of protein than beef, but local irrigation and water scarcity matter. Replacing beef with pulses can reduce a diet's water footprint.
FAO's 2025 assessment classified 35.5% of assessed marine fish stocks as overfished and 64.5% as biologically sustainable. Bottom trawling can damage seabed habitats, including vulnerable corals, and fishing bycatch threatens cetaceans and other wildlife. Outcomes differ by fishery and management; seafood certification should be assessed against its standards and evidence. Seaweed and algae offer non-animal options.
Global averages of land occupied for a year to produce one kilogram. Lower is better.
m² per kg per year
Poore & Nemecek, Science 2018, via Our World in Data
A short timeline of the choices that built industrial animal agriculture.
Identify the animal products you eat most often and look for nutritionally suitable plant-based replacements.
Try beans, lentils or tofu in familiar meals, and think about the whole diet rather than single products.
Plan portions, store food well and use leftovers safely. Buy quantities you can realistically use.
Poore and Nemecek estimated that removing animal products worldwide could cut farmland use by 76% and food emissions by 49%.
The Commission proposed a mostly plant-based reference diet with modest amounts of animal foods, alongside wider food-system changes.
Scarborough and colleagues linked the diets of 55,504 UK adults to environmental data. Vegan diets had lower estimated impacts than high-meat diets on all five indicators.
Make beans, lentils and whole grains the main event; treat any animal product as a garnish or skip it entirely. This single shift outweighs almost every other 'green' choice in the kitchen.
Planning meals and checking what you already have can help reduce waste. Food loss and waste together account for an estimated 8–10% of global greenhouse gas emissions; this includes losses throughout supply chains, not just household waste.
A bag of lentils, a sack of rice and a box of vegetables travel further than ready-meals, packaging-wise and money-wise.
Composting suitable unavoidable scraps can return nutrients to soil. Bokashi ferments waste but needs a further soil or composting stage; a bin alone does not complete the process. Landfilled food can generate methane, which has a stronger warming effect per unit mass than CO₂ over twenty years.
More than three-quarters of global soya is used for animal feed, rather than foods such as soya milk and tofu. Soya expansion can contribute to deforestation, but sourcing varies; do not assume all feed soya is Amazon-linked or all food soya is deforestation-free. Check producers' sourcing information.
Choose products with RSPO-certified palm oil or with no palm oil. Avoid food brands that use uncertified palm oil regardless of whether they are 'vegan'.
Almond irrigation can put pressure on water supplies in California. Almond milk generally uses less freshwater per litre than dairy milk, but it contains much less protein, so compare drinks by the nutrients you need. Variety helps — alternate almonds with peanuts, sunflower seeds, hemp seeds and oats.
Not for climate — yields are lower, so land use rises. Organic is generally better for biodiversity and soil. Both matter; pick by context.
Food type and production usually matter more than distance. Local beef generally has a much larger climate footprint than lentils shipped by sea, but there is no universal fivefold ratio. Local is not always lower-impact: air freight, heated greenhouses, season and production methods can change the comparison.
It has slightly different welfare implications but a similar or higher carbon footprint than feedlot beef (cattle live longer, emit more methane). It cannot scale: there isn't enough land on Earth for everyone to eat grass-fed.
Their impacts depend on where and how they are grown, particularly irrigation in water-stressed regions. 'Per gram of nutrition' is not a defined comparison, and cashews are not automatically lower-impact. Choose a variety of foods and consider local water stress as well as carbon and land use.
Palm oil is in many vegan products and its expansion has driven deforestation. Look for credible certified sourcing and transparent supply chains. Replacing it with coconut, sunflower or rapeseed oil is not automatically better: palm has high yields, so substitutes may require more land. Cattle drive more deforestation globally than palm oil.
The single highest-leverage household climate decision is on the plate, not in the car or boiler room.
Poore and Nemecek's 2018 study in Science drew on data from about 38,700 farms in 119 countries. In their global scenario without animal products, food-related greenhouse-gas emissions fell by 49% and farmland use by 76%. These are modelled global changes, not guaranteed individual savings.[1]
The same study found that meat, aquaculture, eggs and dairy use about 83% of the world's farmland while providing 18% of calories and 37% of protein. Impacts vary between farms, so producer improvements matter as well as diet.[1]
The 2019 EAT–Lancet Commission's reference diet of 2,500 kcal a day includes about 14 g of red meat and 250 g of dairy, with ranges that allow zero red meat. It emphasises legumes, nuts and whole grains as protein sources.[2]
The biggest gains come from doing both: eat plant-based, and also support the food systems and communities that make plant-based easy for everyone else.
Why animal rights belong to no party — and what political capture cost the movement.
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