As we become increasingly aware of the finite limits to the carrying capacity of the planet, the inefficiency of converting eight or nine kilograms of grain protein into one kilogram of animal protein for human consumption would by itself be sufficient argument against continuation of our present dietary habits. When one adds in the abuse of animals inherent to factory farming methods, the depletion and contamination of aquifers, the intense use of grain crops and grazing areas, and the release of methane and other greenhouse gases into the atmosphere, the case against our meat-eating behavior becomes overwhelming. And that is before we factor in the effects of animal fats - an inescapable component of meat and poultry - on human health.

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