Food · emission factor
The Carbon Footprint of Vegetables
50 g CO₂e / 100g
Vegetables have one of the smallest carbon footprints of any food, at around 50 g CO₂e per 100g. That is about 60 times less than beef (2,990 g) and half the footprint of beans. Building meals around vegetables is one of the most reliable ways to shrink your dietary emissions.
Why vegetables have such a low footprint
Vegetables sit at the bottom of the food-emissions ladder for structural reasons. Plants convert sunlight directly into calories, while animal products require feeding crops to livestock first — an energy conversion that loses most of the input. There is no ruminant methane, as with beef and lamb, and no flooded-paddy methane, as with rice. Land use is modest too: field vegetables yield large harvests per hectare, so little land-use change is attributed to them. In the Poore & Nemecek (2018) analysis of roughly 38,000 farms published in Science, vegetables, roots, and brassicas consistently ranked among the lowest-impact foods, with most of their emissions coming from fertilizer production and use, farm machinery, and cold-chain storage rather than from the crop itself.
How 50 g CO₂e compares in context
At 50 g CO₂e per 100g, vegetables emit half as much as beans (100 g), less than half of bread (120 g), and a quarter of tofu or nuts (200 g). Against animal proteins the gap is dramatic: chicken is about 12 times higher, cheese 27 times, and beef nearly 60 times. Put differently, you could eat about 6 kg of vegetables for the footprint of a single 100 g portion of beef. Since food systems account for roughly a quarter to a third of global greenhouse gas emissions, and livestock alone contributes around 14–15% according to the FAO, shifting plate space from animal products to vegetables is one of the highest-leverage dietary changes available.
When vegetables are not so low-carbon
The 50 g figure is an average, and a few practices can push it up. Vegetables grown in heated greenhouses out of season — tomatoes or cucumbers in a northern winter — can carry several times the footprint of field-grown equivalents. Air-freighted produce, such as green beans or asparagus flown between continents, adds substantial transport emissions, though air freight is rare because most produce travels by ship or truck, which adds little. Food waste matters too: vegetables are among the most-wasted foods, and every discarded kilogram wastes the emissions embedded in growing, cooling, and transporting it. Seasonal, field-grown, and actually eaten is the low-carbon combination.
How vegetables compares
How to reduce this footprint
- ✓ Buy seasonal, field-grown vegetables rather than out-of-season produce from heated greenhouses.
- ✓ Avoid air-freighted produce; sea- and road-transported vegetables carry only a small transport footprint.
- ✓ Plan portions and store vegetables properly to cut food waste, which multiplies their effective footprint.
- ✓ Track your meals for a week in Decarbonr to see how swapping meat for vegetables changes your total.
Frequently asked questions
Are vegetables really better for the climate than local meat?
Yes, by a wide margin. At about 50 g CO₂e per 100g, average vegetables emit roughly 60 times less than beef and 12 times less than chicken. Research by Poore & Nemecek shows what you eat matters far more than how far it traveled, because transport is usually a small share of food emissions.
Do imported vegetables have a high carbon footprint?
Usually not. Most imported produce travels by ship or truck, which adds relatively little to the roughly 50 g CO₂e per 100g baseline. The main exceptions are air-freighted items like out-of-season asparagus or berries, which can carry a much larger footprint.
Which vegetables have the lowest carbon footprint?
Field-grown, seasonal vegetables such as root crops, brassicas, and leafy greens are typically the lowest, often below the 50 g CO₂e per 100g average. Out-of-season produce from heated greenhouses sits at the higher end. Choosing what is in season locally keeps you near the bottom of the range.
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Sources & methodology: see Research & scientific references. Figures are averages used by the Decarbonr app; real-world values vary by production system, country, and occupancy.