is great but switching to vegetarianism or veganism can save even more. A western standard meat-based diet produces about 7.2kg of CO2 equivalents per day, while a vegetarian diet produces 3.8kg and a vegan diet 2.9kg.
Some vegetarian or vegan foods like avocados and almonds also have a huge water footprint, but overall aA global move away from meat would also free up a huge amount of land, since billions of animals would no longer have to be fed. Soya, for instance, is one of the world’s most common crops yet almost 80 per cent of the world’s soybeans are fed to livestock.
Yet both specialist food and supplements are too expensive for many people around the world and it would be hard to scale up supplements production to provide for billions of extra people.