The carbon footprint of a beef burger (vs chicken and beans)
A single beef burger carries roughly 3 to 6 kg of CO₂-equivalent, depending on the patty size — more than ten times the footprint of a bean burger. Almost all of it comes from one ingredient: the beef.
Where the emissions are
Using the Poore & Nemecek figures (beef ≈ 60 kg CO₂e per kg), a quarter-pound patty (~150 g of raw beef) is already about 9 kg CO₂e at the high end for beef-herd cattle, or closer to 3–4 kg for dairy-herd beef. Add a bun, cheese, and sauce and a typical burger lands in the 3–6 kg range. The bun and salad are almost noise:
| Burger (one serving) | ~kg CO₂e |
|---|---|
| Beef patty (150 g raw) | ~3–9 |
| Cheese slice (20 g) | ~0.4 |
| Bun | ~0.1 |
| Lettuce, tomato, sauce | ~0.1 |
| Chicken burger (same size) | ~1 |
| Bean / veggie burger | ~0.2–0.4 |
Swapping the beef for chicken cuts the burger’s footprint by roughly 70–80%; swapping for beans cuts it by over 90%.
Why beef is the outlier
Cattle are ruminants: their digestion produces methane, a potent greenhouse gas, and they need a lot of land and feed per kilo of meat. That’s why beef and lamb sit far above every other food — it’s biology, not just farming method. “Grass-fed” and “local” change the number only modestly; what the animal is beats how it was raised.
The honest framing
You don’t have to never eat a burger. But it’s worth knowing that one beef burger a week is, over a year, on the order of 150–300 kg CO₂e — a meaningful slice of a food footprint. The cheapest win on the menu is simply choosing chicken or beans more often than beef. CO2Mate logs meals against these same factors, so the trade-off shows up as real numbers rather than guilt.
Sources: Poore & Nemecek (2018), Science, via Our World in Data, “Environmental impacts of food production”.