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Meat and dairy When animals are fed human-edible crops, this is the most inefficient part of the global food supply in terms of calories, protein and micro-nutrient terms. The inefficiency is also costly in greenhouse gas terms especially when the animals are ruminants (sheep and cattle) and typically double their impact through the belching of methane. Other problems include the two thirds of the world's antibiotics that are used in animal farming, and the welfare of the beasts themselves.