Ingredient Impact 101: Your Guide to the Carbon Emissions of Food Ingredients

Beef consistently tops the list of high-carbon food ingredients, generating significantly more CO2e per kilogram than almost any other food category—primarily due to methane emissions from livestock and the land required for grazing and feed production. Lamb, cheese, and butter follow closely, with dairy products as a category carrying a substantially higher footprint than plant-based alternatives. Understanding which ingredients drive the most emissions is the starting point for any meaningful reduction in a food business's carbon footprint. Read how to calculate the carbon footprint of food and explore food carbon footprint benchmarks: see how you compare.

Animal proteins—particularly ruminant meat like beef and lamb—generate more greenhouse gas emissions than plant-based ingredients for several compounding reasons. Ruminant animals produce methane during digestion, require large areas of land for grazing and feed crop production, and consume far more calories as feed than they produce as food. By contrast, plant-based proteins like legumes, lentils, and tofu require significantly less land, water, and energy to produce per kilogram of edible output. Explore food carbon footprint: tools, methods, and impact and from field to fork: the impact of food supply chains.

 

Food miles—the distance an ingredient travels from farm to kitchen—contribute to its carbon footprint through transport emissions, but they are rarely the dominant factor. For most ingredients, the production phase (farming, feed, land use) accounts for far more emissions than transport. A locally produced beef steak, for example, will almost always carry a higher carbon footprint than imported lentils. This is why origin alone is an unreliable guide to carbon impact, and why full lifecycle assessment data is needed for accurate measurement. Read food miles vs. full carbon footprint and LCA explained: life cycle assessment for food businesses.

 

Among protein sources, legumes—lentils, chickpeas, black beans—consistently deliver the lowest carbon footprint per kilogram, followed by tofu, tempeh, and other plant-based proteins. Among animal proteins, sustainably sourced shellfish such as mussels and oysters have among the lowest footprints, as they require no feed inputs and can improve water quality. Poultry and eggs carry significantly lower footprints than beef or lamb, making them a more climate-efficient choice when plant-based options are not practical. See sustainable food production trends shaping the industry and from carbon data to better food decisions.

 

Seasonal produce grown outdoors in its natural growing period has a significantly lower carbon footprint than the same ingredient grown out of season in heated greenhouses or flown in from warmer climates. A tomato grown in a UK greenhouse in winter, for example, can carry a carbon footprint many times higher than one grown outdoors in summer. For food businesses looking to reduce menu emissions, aligning ingredient sourcing with seasonal availability is one of the most straightforward and cost-effective strategies available. Read how to calculate the carbon footprint of food and what credible food climate data looks like.

Chefs and menu developers can use ingredient carbon data in the same way they use food cost data—as a filter applied during dish development and menu review. By knowing the CO2e per kilogram of each core ingredient, they can make informed substitutions, design lower-carbon specials, and identify which dishes are pulling the menu's overall carbon intensity up. Platforms like Klimato make this data available at the ingredient level, integrated directly into recipe workflows, so carbon becomes a natural part of the development process rather than a separate audit. Explore maximizing menu profitability through climate-smart choices and green menu makeover: boost your sales with climate labeling.