Thanks to the team at Oxford University who run the website Our World in Data, we can make quick and easy comparisons between the foods we eat.175 Its charts show that, to produce 100 grammes of soy protein, eaten by humans in the form of tofu, requires just over two square metres of land. To raise 100 grammes of egg protein requires just under six square metres. Chicken protein needs seven, and pork ten square metres. Chickens and pigs need more land than tofu does because they cannot turn everything they eat into meat, as they have to sustain themselves and build other body parts. Milk, the
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