(i) The shift from grains to meat diets, creates more demand for cereals as it takes 3-10 kg of grain to produce 1 kg of meat by animal farming.
(ii) This research is related to single cell protein. Microbes . are being grown-on an industrial scale as a good source of protein.
Microbes like Spirulina can be grown easily on materials like waste water from potato processing plants (containing starch), straw, molasses, animal manure and even sewage, to produce large quantities and can serve as food rich in protein, minerals, fats, carbohydrate and vitamins. Such utilisation also reduces the environmental pollution.