FOOD & THE ENVIRONMENT
Food is one of the most powerful forces shaping our planet. Every meal we cook, every ingredient we buy, and every piece of food we throw away has an environmental consequence — and those consequences, multiplied across billions of people and trillions of meals, add up to one of the most significant environmental challenges of our time. The global food system is responsible for approximately one third of all human-caused greenhouse gas emissions, is the single largest driver of biodiversity loss, uses more freshwater than any other human activity, and generates hundreds of millions of tonnes of waste every year.
But food is also one of the areas where individual and collective action can make a genuine difference. The choices made in kitchens — professional and domestic — about what to buy, how to cook it, and what to do with what is left over are not trivial. They are part of a global conversation about how we feed a growing population on a planet with finite resources, without destroying the ecosystems that make food production possible in the first place.
This section is not about guilt or restriction. It is about understanding — because informed cooks make better decisions, and better decisions, made consistently and at scale, can genuinely change things.
The Carbon Footprint of Food Production
A carbon footprint is a measure of the total greenhouse gas emissions — primarily carbon dioxide, methane, and nitrous oxide — produced directly and indirectly by a product, process, or activity. In the context of food, the carbon footprint encompasses every stage of a food's journey from production to consumption — a concept known as farm to fork, or more comprehensively, as a life cycle assessment.
Greenhouse Gases in the Food System
The food system produces three primary greenhouse gases, each with different sources and different potencies.
Carbon dioxide is produced by the burning of fossil fuels throughout the food system — in farm machinery, in food processing and manufacturing facilities, in refrigeration and cold chain logistics, in transportation, and in the energy used to cook and store food. Deforestation for agricultural land — particularly in tropical regions — releases enormous quantities of carbon dioxide stored in trees and soil into the atmosphere.
Methane is produced primarily by livestock — particularly ruminants such as cattle and sheep — through a digestive process called enteric fermentation, in which microbes in the animal's digestive system break down plant material and produce methane as a byproduct. Methane is also produced by the decomposition of organic waste in landfill sites, including food waste. Methane is approximately 28 times more potent as a greenhouse gas than carbon dioxide over a 100-year period, making livestock emissions a particularly significant contributor to climate change.
Nitrous oxide is produced primarily by the application of synthetic nitrogen fertilisers to agricultural soils, and by the decomposition of animal manure. Nitrous oxide is approximately 265 times more potent as a greenhouse gas than carbon dioxide over a 100-year period, making fertiliser use in intensive agriculture a major climate concern.
The Carbon Footprint of Different Foods
Not all foods are created equal from an environmental perspective, and understanding the relative carbon footprints of different foods is one of the most practically useful pieces of environmental knowledge a cook can have.
Beef has by far the highest carbon footprint of any commonly consumed food — approximately 60kg of CO2 equivalent per kilogram of beef produced, when land use change is taken into account. This is driven by methane from enteric fermentation, the large land area required to raise cattle, the water and feed inputs required, and in many regions, the conversion of forests and grasslands to pasture. Lamb and dairy products also have relatively high carbon footprints for similar reasons.
Pork and poultry have significantly lower carbon footprints than beef and lamb — typically between 5 and 10kg of CO2 equivalent per kilogram — because pigs and chickens are monogastric animals that do not produce methane through enteric fermentation, and because they convert feed to edible protein more efficiently than ruminants.
Fish and seafood vary enormously depending on how they are caught or farmed. Wild-caught fish from well-managed fisheries can have a very low carbon footprint, while certain forms of aquaculture — particularly those involving high-protein feed inputs — can be more emissions-intensive. Bottom trawling, one of the most widely used commercial fishing methods, is increasingly recognised as a significant source of carbon emissions through the disturbance of carbon-rich seafloor sediments.
Plant-based foods — fruits, vegetables, legumes, grains, nuts, and seeds — generally have the lowest carbon footprints of all food categories, often by an order of magnitude compared to animal products. Legumes such as lentils, chickpeas, and beans are particularly remarkable from an environmental perspective — they fix atmospheric nitrogen into the soil, reducing the need for synthetic fertilisers, while providing high-quality plant protein at a fraction of the environmental cost of animal protein.
The Impact of Transportation and Seasonality
Air freight is the most carbon-intensive method of food transportation and is used primarily for highly perishable products — fresh berries, exotic fruits, certain vegetables, and fresh fish — that need to reach consumers quickly. Foods transported by air can have a carbon footprint many times higher than the same food transported by ship or road.
However, it is important to note that transportation — including air freight — typically accounts for a relatively small proportion of a food's total carbon footprint compared to the emissions generated during production. A kilogram of local beef has a far higher carbon footprint than a kilogram of air-freighted Kenyan green beans, simply because of the fundamental difference in emissions between livestock and plant production. The most significant environmental lever available to consumers is not food miles but food choices — specifically, shifting toward a diet with less animal protein and more plant-based foods.
Seasonality matters for a different reason. Out-of-season produce grown in heated greenhouses — particularly in northern European climates — can have a surprisingly high carbon footprint due to the energy required to maintain growing conditions. Strawberries grown in a heated greenhouse in January can have a higher carbon footprint than the same strawberries imported from a sunny southern European climate, even accounting for transportation. Buying seasonally grown produce — whether local or imported from an appropriate climate — is generally the more environmentally sound choice.
Food Waste and Its Global Impact
Food waste is one of the most significant and most solvable environmental problems we face. According to the United Nations Food and Agriculture Organization, approximately one third of all food produced globally for human consumption is lost or wasted — roughly 1.3 billion tonnes every year. If food waste were a country, it would be the third largest emitter of greenhouse gases on the planet, behind only the United States and China.
The Scale of the Problem
Food is wasted at every stage of the supply chain. In lower-income countries, most food loss occurs early in the supply chain — at the farm, during storage, and in transportation — due to inadequate infrastructure, lack of refrigeration, and poor storage facilities. In higher-income countries, the picture is reversed — most food waste occurs at the retail and consumer level, where food is bought, forgotten, and thrown away.
In the United Kingdom alone, households waste approximately 6.4 million tonnes of food every year — the majority of which was edible at the time it was thrown away. The most commonly wasted foods are fresh vegetables and salad, fresh fruit, bread and bakery products, and cooked or prepared meals. The financial cost of this waste to the average UK household is estimated at over £700 per year.
The Environmental Cost of Food Waste
Every piece of food that is wasted represents not just the food itself but all of the resources — land, water, energy, labour, and emissions — that went into producing it. When food is thrown away, all of those embedded resources are wasted with it. When that wasted food ends up in landfill — as most of it does — it decomposes anaerobically and produces methane, compounding the environmental damage.
The water footprint of food waste is equally staggering. Producing a kilogram of beef requires approximately 15,000 litres of water — meaning that every kilogram of beef wasted represents 15,000 litres of water used for nothing. A glass of milk requires approximately 200 litres of water to produce. A single avocado requires approximately 320 litres. When these foods are wasted, so is every drop of the water that produced them.
Reducing Food Waste in the Home Kitchen
Reducing food waste at home is one of the most impactful environmental actions an individual can take — and it also saves money and improves cooking. The following principles, consistently applied, can dramatically reduce the amount of food wasted in a domestic kitchen.
Plan before you shop. Making a meal plan for the week and shopping from a list — rather than buying speculatively — is the single most effective way to reduce food waste. It ensures that everything bought has a purpose and a plan, reducing the likelihood of food being forgotten and going bad.
Understand your labels. As discussed in the section on food labels, best before dates are quality indicators, not safety indicators. The vast majority of food past its best before date is safe to eat and perfectly good to consume. Developing the confidence to use your senses — sight, smell, and taste — rather than rigidly discarding food at its best before date eliminates an enormous amount of unnecessary waste.
Store food correctly. Many foods are wasted simply because they are stored incorrectly and deteriorate faster than necessary. Bread keeps better in a cool, dry place or the freezer than in the fridge, where it stales more rapidly due to the process of retrogradation. Most fresh herbs keep far longer stored upright in water in the fridge. Onions and potatoes should be stored in a cool, dark, well-ventilated place — not in the fridge. Apples emit ethylene gas that accelerates the ripening of nearby fruits and vegetables and should be stored separately.
Use everything. Nose-to-tail and root-to-tip cooking — using every part of an ingredient rather than just the prime cuts or the most convenient sections — is both a culinary philosophy and an environmental practice. Vegetable peelings, herb stalks, leek tops, meat bones, and fish frames all have enormous culinary value when treated with respect. Stock made from vegetable trimmings and meat bones costs nothing, wastes nothing, and produces one of the most versatile and flavourful ingredients in the kitchen. Stale bread becomes breadcrumbs, croutons, or panzanella. Overripe fruit becomes compote, smoothies, or baked goods. The most resourceful cooks are invariably the most creative ones.
Reducing Food Waste in Professional Kitchens
In professional kitchens, food waste has both environmental and financial implications. A well-run kitchen minimises waste through rigorous stock rotation, careful portion control, intelligent menu planning that uses the whole of each ingredient across multiple dishes, and regular stock takes that identify slow-moving items before they spoil.
The concept of mise en place — preparing and organising ingredients before service — naturally encourages a whole-ingredient approach, as professional cooks are trained to find a use for every trim, offcut, and by-product of preparation. Carrot tops become garnishes or stock ingredients. Parmesan rinds go into soups and risottos. Chicken carcasses become the foundation of the next batch of stock.
Many progressive professional kitchens are now going further — implementing composting programmes for unavoidable food waste, partnering with surplus food redistribution organisations, and tracking waste carefully to identify and address its root causes.
Sustainable Food Technologies
Technology is playing an increasingly important role in addressing the environmental challenges of the global food system. From the way food is grown and produced to the way it is packaged and distributed, a new generation of food technologies is emerging with the potential to dramatically reduce the environmental footprint of what we eat.
Precision Agriculture
Precision agriculture uses technology — including satellite imaging, drone surveillance, soil sensors, GPS-guided machinery, and data analytics — to optimise every aspect of crop production. By applying water, fertiliser, and pesticides only where and when they are needed — rather than uniformly across entire fields — precision agriculture significantly reduces waste, lowers input costs, and minimises the environmental impact of crop production. Sensors embedded in soil can measure moisture levels in real time, enabling irrigation systems to deliver exactly the right amount of water to exactly the right location, reducing water use by up to 50% compared to conventional irrigation.
Vertical Farming and Controlled Environment Agriculture
Vertical farming involves growing crops in stacked layers in controlled indoor environments, using artificial lighting, precise temperature control, and hydroponic or aeroponic growing systems that deliver water and nutrients directly to plant roots. Vertical farms use up to 95% less water than conventional agriculture, require no pesticides, can be located in urban environments close to consumers — reducing transportation emissions — and can produce food year-round regardless of climate or season.
The current limitations of vertical farming are significant — particularly the high energy consumption of artificial lighting, which can offset many of the environmental benefits unless powered by renewable energy. However, as LED lighting technology improves and renewable energy becomes more accessible, vertical farming is increasingly viable for a growing range of crops, particularly leafy vegetables, herbs, and soft fruits.
Alternative Proteins
The environmental case for reducing global consumption of animal protein and replacing it with alternative protein sources is compelling and well-evidenced. Several technologies are emerging to make this transition both more feasible and more appealing.
Plant-based meat alternatives — products designed to replicate the taste, texture, and appearance of meat using plant-derived ingredients — have advanced dramatically in recent years. Products made from pea protein, soy protein, mycoprotein, and other plant sources are now capable of closely mimicking the sensory experience of eating meat, and their production generates a fraction of the greenhouse gas emissions and uses a fraction of the land and water of conventional animal agriculture.
Cultivated meat — sometimes called lab-grown meat or cell-cultured meat — is produced by taking a small sample of animal cells and growing them in a nutrient-rich culture medium outside of the animal's body. The resulting product is real animal meat, produced without slaughter and with significantly lower land use and, potentially, lower greenhouse gas emissions than conventional livestock farming. Cultivated meat has received regulatory approval in a small number of markets and is expected to become more widely available as production costs continue to fall.
Fermentation-derived proteins — produced by precision fermentation, in which microorganisms are programmed to produce specific proteins — represent another frontier in sustainable protein production. This technology is already used to produce rennet for cheesemaking and certain food enzymes, and is increasingly being applied to produce animal-identical proteins — including dairy proteins and egg white proteins — without any involvement of animals.
Insect protein is well established as a sustainable food source in many parts of the world and is attracting growing interest in Western markets as an ingredient in food products. Insects require a fraction of the land, water, and feed of conventional livestock, produce minimal greenhouse gases, and can be raised on organic waste streams. Insect-derived ingredients are increasingly appearing in protein bars, flour products, and animal feed.
Sustainable Packaging
Food packaging is a significant source of plastic waste and environmental pollution. A new generation of sustainable packaging materials is emerging to address this — including compostable bioplastics derived from plant starch, edible packaging made from seaweed or other natural materials, and advanced paper-based packaging that replicates the barrier properties of plastic without the environmental consequences. Packaging reduction — through bulk buying, refillable formats, and concentrated products — is also gaining traction as a mainstream consumer and retail trend.
Food Waste Technology
Technology is also being applied directly to the problem of food waste. Apps and platforms that connect food businesses with surplus food — enabling unsold food to be redistributed to consumers at reduced prices rather than thrown away — have grown rapidly in recent years. Smart refrigeration systems that track the contents and freshness of food, alerting users to items approaching their use by date, are increasingly affordable for domestic use. Anaerobic digestion — a process in which food waste is broken down by microorganisms in the absence of oxygen to produce biogas and nutrient-rich digestate — converts unavoidable food waste into a source of renewable energy and agricultural fertiliser, closing the loop on waste that cannot be prevented.
The Future of Food
The global food system is at an inflection point. The combination of a growing global population — projected to reach approximately 10 billion by 2050 — climate change, biodiversity loss, water scarcity, and the compounding effects of decades of intensive agriculture means that the way the world produces and consumes food must change significantly over the coming decades. The question is not whether change is coming — it is what form that change will take.
The Protein Transition
The single most significant shift expected in the global food system over the coming decades is a transition away from animal-based protein toward plant-based and alternative protein sources. This transition is being driven simultaneously by environmental necessity, technological innovation, changing consumer values, and economic forces. In many markets, the consumption of conventional meat is already declining — particularly among younger generations — while sales of plant-based alternatives, flexitarian-friendly products, and sustainably produced animal proteins are growing.
This does not mean the end of meat — nor should it. Well-managed livestock farming plays an important role in sustainable agricultural systems, contributing to soil health, biodiversity, and the livelihoods of rural communities around the world. The goal is not elimination but proportion — shifting the balance of the global diet toward less and better animal protein, and more diverse plant-based foods.
Regenerative Agriculture
Regenerative agriculture is an approach to farming that goes beyond sustainability — rather than simply minimising harm, it actively seeks to restore and improve the health of agricultural ecosystems. Regenerative practices include minimising soil disturbance through reduced tillage, maintaining permanent soil cover with cover crops and mulch, diversifying crop rotations, integrating livestock into cropping systems, and restoring hedgerows, wetlands, and other natural habitats within and around farms.
Healthy soil — rich in organic matter, teeming with microbial life, and structurally intact — is one of the most powerful carbon sinks available. Regenerative agriculture has the potential to sequester significant quantities of atmospheric carbon in soil, while simultaneously improving biodiversity, water retention, crop resilience, and the long-term productivity of agricultural land. It represents one of the most promising and most discussed approaches to making food production genuinely sustainable.
Food System Localisation
There is growing interest in shortening food supply chains — bringing producers and consumers closer together geographically and reducing the complexity, opacity, and emissions of the global food system. Farmers markets, community-supported agriculture schemes, urban food growing initiatives, and direct-to-consumer food businesses are all expressions of this trend. Localised food systems offer benefits including greater transparency, stronger producer-consumer relationships, reduced transportation emissions, and the preservation of local food cultures and crop diversity.
However, localisation is not a universal solution — as noted above, locally produced food is not always the most environmentally sound choice, particularly in climates where heating or artificial lighting would be required to grow certain crops. The most sensible approach is a nuanced one — supporting local food systems where they make genuine environmental and social sense, while maintaining a realistic perspective on the limits of localisation as a global strategy.
Food Culture and the Cook's Role
Ultimately, the future of food will be shaped not just by technology, policy, and industry, but by culture — by the values, habits, and preferences of billions of individual cooks and eaters. Chefs, food educators, food writers, and home cooks all have a role to play in shaping food culture toward more sustainable patterns of eating — not through moralising or restriction, but through the more powerful tools of inspiration, creativity, and deliciousness.
The most persuasive argument for sustainable eating is not a carbon calculator or a guilt trip — it is a beautifully cooked plate of seasonal vegetables, a perfectly prepared pulse dish, a fermented condiment made from ingredients that would otherwise have been wasted. Great cooking has always been the most effective ambassador for great food. And great food, in the years ahead, will increasingly be food that is as good for the planet as it is for the people eating it.
Why Food and the Environment Matters to Every Cook
You do not have to be an environmental activist to care about the relationship between food and the environment. You just have to care about cooking — because the environmental health of the planet is inseparable from the quality, diversity, and abundance of the ingredients available to cook with. Healthy soils produce more flavourful vegetables. Well-managed fisheries produce better fish. Diverse agricultural systems produce a wider range of ingredients. The environmental and the culinary are not in tension — they are, ultimately, the same conversation.
Understanding the environmental dimensions of food makes you a more complete cook, a more informed professional, and a more conscious participant in one of the most important challenges of our time.
Simple Preservation Methods You Can Do at Home
Food preservation is not the exclusive domain of the food industry. Many of the most effective and most satisfying preservation techniques are well within the reach of the home cook, requiring minimal specialist equipment and producing results that are far superior to anything commercially available.
Refrigeration and Correct Storage
The most accessible and most important food preservation tool in the home kitchen is the refrigerator — but its effectiveness depends entirely on how it is used. A refrigerator set to the correct temperature — between 0°C and 5°C — and organised correctly will significantly extend the life of fresh food.
Raw meat and fish should always be stored on the bottom shelf, in sealed containers or on trays, to prevent any drip contamination of other foods. Cooked foods and ready-to-eat items should be stored above raw proteins. Dairy products keep best toward the back of the fridge where temperatures are most consistent, while eggs should be stored in the main body of the fridge rather than in the door where temperatures fluctuate. Fresh herbs can be stored upright in a small glass of water, like flowers, covered loosely with a bag — this extends their life significantly compared to leaving them loose in the fridge.
Pickling
Pickling is one of the oldest and most versatile preservation methods, and one of the most rewarding to practise at home. It works by creating an acidic environment — using vinegar or naturally produced lactic acid — that inhibits the growth of spoilage microorganisms.
Quick pickling, or refrigerator pickling, is the simplest form — vegetables are submerged in a hot brine of vinegar, water, salt, and sugar, sealed in a jar, and refrigerated once cooled. Quick pickles are ready to eat within hours or days and will keep in the refrigerator for several weeks. They are enormously versatile — almost any vegetable can be quick-pickled — and add brightness, acidity, and complexity to dishes that no fresh ingredient can replicate.
Lacto-fermentation is a more traditional form of pickling that relies on naturally occurring lactic acid bacteria rather than added vinegar. Vegetables are submerged in a salt brine that suppresses harmful bacteria while allowing beneficial lactobacillus bacteria to produce lactic acid through fermentation. Sauerkraut, kimchi, and naturally fermented pickled cucumbers are all made through lacto-fermentation. The process takes longer than quick pickling — typically one to four weeks — but produces deeper, more complex flavours and a product rich in beneficial probiotics.
Curing
Curing at home — particularly the dry-curing of fish — is one of the most accessible and most impressive preservation techniques available to the home cook. Gravlax — the Scandinavian preparation of salt and sugar cured salmon — requires nothing more than a fillet of fresh salmon, salt, sugar, and dill, and produces a result that is both superior to commercially produced smoked salmon and remarkably simple to make. The salt and sugar draw moisture from the fish through osmosis, firming the flesh, intensifying the flavour, and extending the shelf life of the fish significantly.
Dry-curing of meat — making your own pancetta, guanciale, or bresaola at home — is more involved and requires careful attention to salt ratios, temperature control, and hygiene, but is well within the reach of the dedicated home cook and produces exceptional results.
Confit
Confit is a traditional French preservation method in which food — classically duck legs, goose, or pork — is cooked slowly in its own fat at a low temperature, then submerged and stored in that fat in a sealed container. The fat acts as a barrier to oxygen and microorganisms, preserving the food and improving its flavour and texture over time. A properly made and stored duck confit can keep for several months. In modern home cooking, the confit technique is applied to a much wider range of ingredients — confit garlic, confit tomatoes, and confit citrus all produce intensely flavoured results that keep well and are enormously versatile in the kitchen.
Dehydration
Dehydrating food removes the moisture that microorganisms need to survive and multiply, significantly extending shelf life. At home, dehydration can be achieved using a purpose-built food dehydrator, a conventional oven set to its lowest temperature with the door slightly ajar, or simply by air-drying in a warm, well-ventilated environment. Dehydrating herbs, mushrooms, tomatoes, and fruits at home produces results that are considerably more flavourful and aromatic than their commercially produced equivalents. Homemade dried herbs retain far more essential oil and flavour than most shop-bought varieties, and sun-dried or oven-dried tomatoes made at home from seasonal produce are incomparably better than tinned alternatives.
Vacuum Sealing
Vacuum sealing removes the air from around food before sealing it in an airtight bag or container, dramatically reducing oxidation and significantly extending shelf life — both in the refrigerator and the freezer. Home vacuum sealers are increasingly affordable and represent one of the most useful investments a serious home cook can make. Vacuum-sealed fresh meat or fish will keep in the refrigerator approximately three to five times longer than the same product stored in conventional packaging. In the freezer, vacuum sealing eliminates freezer burn entirely by removing the air that causes it.
Vacuum sealing is also the essential first step in sous vide cooking — a technique in which food is sealed in a vacuum bag and cooked at a precisely controlled low temperature in a water bath, producing results of exceptional consistency and quality.
Infusing in Oil
Preserving herbs, garlic, chillies, and aromatics in oil is a simple and rewarding technique that produces beautifully flavoured oils for cooking and finishing dishes. However, it requires careful attention to food safety — particularly in the case of garlic in oil, which can support the growth of Clostridium botulinum in an anaerobic — oxygen-free — environment if not handled correctly. Garlic in oil should always be stored in the refrigerator and used within one to two weeks, or the garlic should be dried thoroughly before infusing. Commercial garlic oils are acidified to prevent botulism — a step worth replicating at home by adding a small amount of vinegar or lemon juice to homemade infusions.
Why Keeping Food Fresh Matters
Understanding how to keep food fresh is not a minor technical detail — it is one of the most practically significant areas of culinary knowledge available. It determines the quality of your cooking, the safety of your kitchen, the efficiency of your operation, and the impact you have on food waste. Every cook, at every level, benefits from taking it seriously — and the knowledge in this section gives you everything you need to do exactly that.