"Cows eat grass and silage. This is melting the ice caps and killing us all. So they need a new foodstuff: something that is rich in iron, calcium and natural goodness. Plainly they cannot eat meat so here is an idea to chew on. Why not feed them vegetarians?"

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An important fact to remember is that all natural diets, including purely vegetarian diets without a hint of dairy products, contain amounts of calcium that are above the treshold for meeting your nutritional needs....In fact,calcium deficiency caused by an insufficient amount if calcium in the diet is not known to occur in humans.

— John A. McDougall