Beef produces 85 kg CO2e per kg of food. Tofu produces 2.9 kg CO2e per kg of food.
Greenhouse gas emissions are measured in kilograms of carbon dioxide-equivalents (CO₂eq) per kilogram of food.
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Why is beef from a beef herd worse than beef from a dairy herd?
I think just because dairy cows live longer. Beef cows are killed younger, you don't need to wait until their milk production dwindles. It's not clear if accounting for the milk carbon footprint was taken into account or not.