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Compare the carbon footprint of different protein sources per kilogram. See how beef, chicken, pork, tofu, and lentils stack up on CO2, water use, and land use.
Beef produces approximately 27 kg CO2e per kg — roughly 4x more than chicken (6.9 kg), 9x more than tofu (3 kg), and 30x more than lentils (0.9 kg). Per gram of protein, beef emits 5–10x more CO2 than plant-based alternatives.
27
kg CO2e
💧 15,400 L water
🌱 164 m² land
7
kg CO2e
💧 4,325 L water
🌱 12.2 m² land
8
kg CO2e
💧 5,988 L water
🌱 10.7 m² land
3
kg CO2e
💧 2,523 L water
🌱 3.4 m² land
1
kg CO2e
💧 1,250 L water
🌱 7.1 m² land
Beef's enormous carbon footprint comes from three main sources: (1) Methane emissions from cattle digestion (enteric fermentation), which accounts for about 40% of beef's total emissions; (2) Land use change — cattle farming is the leading driver of deforestation, especially in the Amazon; (3) Feed production, which requires vast amounts of land, water, and fertilizer. A single kilogram of beef requires roughly 7 kg of feed grain and 15,400 litres of water.
When comparing emissions per gram of protein (a more nutritionally fair metric), the gap between beef and plant proteins is even wider. Beef produces about 10.4 kg CO2e per 100g of protein, while lentils produce just 0.4 kg — a 26x difference. Chicken and tofu fall in between at 3.5 and 1.6 kg respectively. This means you can get the same amount of protein with a fraction of the environmental cost by choosing plant-based sources.
Carbon is only part of the story. Beef production uses approximately 164 m² of land and 15,400 litres of water per kilogram — compared to tofu's 2.2 m² and 2,000 litres. Globally, livestock farming occupies over 70% of agricultural land while supplying just 17% of the world's calories. Shifting to more plant-based proteins could free up land for reforestation, which would itself absorb hundreds of gigatonnes of CO2 — making dietary change one of the highest-leverage climate actions available.
You don't need to eliminate meat entirely to make a big difference. (1) Replace one beef meal per week with chicken, tofu, or legumes — saves ~100–200 kg CO2 per year. (2) Try 'Meatless Mondays' — saves ~300–400 kg CO2 per year. (3) Go flexitarian (meat just 2–3 days per week) — saves ~500–700 kg CO2 per year. (4) Go vegetarian — saves ~700–900 kg CO2 per year. (5) Go vegan — saves ~1,000–1,200 kg CO2 per year. Even small, consistent changes in the direction of less beef compound significantly over a lifetime.
Covers practical follow-up questions readers often ask
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