Build a plate, then see the same plate with every animal ingredient swapped for its closest plant equivalent. Emissions, freshwater and land are cradle-to-retail global means from Poore & Nemecek's analysis of 38,700 farms.
16.65 kg CO₂e
1.23 kg CO₂e
Swapping the animal ingredients saves 15.43 kg CO₂e — a 93% cut — 2,238 litres of water (about 34 showers) and 52.01 m² of farmland. Done once a week for a year, that is 802 kg CO₂e.
| Food | kg CO₂e / kg | Relative |
|---|---|---|
| Beef mince | 99.5 | |
| Lamb | 39.7 | |
| Cheese | 23.9 | |
| Fish (farmed) | 13.6 | |
| Pork | 12.3 | |
| Butter | 12.1 | |
| Chicken breast | 9.9 | |
| Olive oil | 6.0 | |
| Eggs | 4.7 | |
| Brown rice, cooked | 4.0 | |
| White rice, cooked | 4.0 | |
| Vegan cheese | 3.9 | |
| Plant-based burger patty | 3.5 | |
| Dairy yoghurt | 3.5 |
Poore & Nemecek (2018) in Science, a meta-analysis of 38,700 farms in 119 countries. Values are global means of cradle-to-retail emissions per kilogram of food, including land-use change, farm, processing, transport, packaging and retail.
Rarely. Transport is typically under 10 percent of the footprint of most foods, and under 1 percent for beef. What the food is matters far more than how far it travelled, which is why swapping the protein beats buying local.
A single 150 g beef portion carries roughly 15 kg CO2e — comparable to driving around 60 km in an average petrol car. Replacing it with tofu or lentils removes about 95 percent of that.
Not enough to close the gap. Even the lowest-impact 10 percent of beef producers emit several times more per gram of protein than the highest-impact producers of peas or tofu.
Method
This tool answers a narrower question than a full carbon calculator: for one specific plate, how much difference does the protein choice make? That framing is deliberate, because meals are what people actually decide about.
Annual footprints are motivating for about a day. Meal-level figures survive contact with a menu: they attach a number to the decision you are making in the next ten minutes. A bean chilli against a beef chilli is roughly a 20-fold difference in emissions and a 100-fold difference in land use — a gap large enough that portion size, cooking method and packaging barely register beside it.
Each swap is matched on cooked weight and rough culinary role rather than on protein grams, because that is how recipes work in practice. Where the plant version is less protein-dense, the tool notes it instead of silently inflating the portion. Emissions come from median life-cycle values; land and water follow the same source so the three metrics stay internally consistent.
Cooking energy, refrigeration in your own kitchen and the emissions of your journey to the shop are excluded — together they are usually under 5% of a meal's footprint. Also excluded is the carbon opportunity cost of the land involved, which would widen the gap between animal and plant meals considerably if included.
One meal changes nothing measurable. The same swap made twice a week for a year avoids roughly 300–500 kg of CO₂-equivalent if it replaces beef, which is comparable to a short-haul return flight. The tool shows both the single-meal number and the annualised figure for exactly this reason.
Per typical serving, including the main protein component only.
| Meal | Animal version | Plant version | Emissions saved |
|---|---|---|---|
| Chilli | Beef mince, 150 g | Black beans + lentils | ~3.6 kg CO₂e |
| Burger | Beef patty, 113 g | Bean or soy patty | ~2.6 kg CO₂e |
| Bolognese | Pork & beef mince | Lentil & mushroom | ~1.9 kg CO₂e |
| Curry | Chicken thigh, 150 g | Chickpea & spinach | ~1.3 kg CO₂e |
| Breakfast | Two eggs + butter | Tofu scramble | ~0.5 kg CO₂e |
| Coffee | Dairy latte | Oat latte | ~0.3 kg CO₂e |
Derived from Poore & Nemecek (2018) median product footprints.
The recurring weeknight dinner is worth more than the special-occasion roast, simply because it happens fifty times a year.
Where a swap is less protein-dense, add a side that closes the gap — yoghurt made from soy, a handful of nuts, or a larger legume portion.
A 1.3 kg saving looks trivial. Multiplied by a twice-weekly habit it becomes 135 kg — visible on a household footprint.
Coffee milk, sandwich filling and the weekly mince dish together often cut a food footprint by a third without touching anything you consider a treat.
Yes, comfortably. Published assessments put plant-based burgers at roughly a tenth of beef's emissions and a twentieth of its land use, even accounting for processing energy.
They help at the margin. Seasonal and local reduces the transport and heated-greenhouse share, which is small; the protein choice governs the large share.
On climate, yes — roughly a tenth of beef per kilogram. On animals, it is the worst common choice, because far more individuals are killed per kilogram of meat.
Within perhaps ±30% for the specific plate, and far more reliable as a comparison between two versions of the same plate.
Not in the displayed figure, but it matters: about a fifth of food bought in high-income households is thrown away, and wasting a beef meal doubles its effective footprint.