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A1) An excursus on the presence of methane in the atmosphere and its evolution over the eons, to arrive at current ruminants. A2) Cattle vs. cars. Is it true that a bovine pollutes more than a car? Brief practical refutation of this prejudice. A3) What have we eaten for 2.5 million years? Brief history of the hominid diet and the role of foods of animal origin in the evolution of man.