Quote from Michael Pollan

The great value of a diversified food economy,like a diverse pasture or farm,is the ability to withstand any shock.The important thing is that there be multiple food chains,so that when any one of them fails-when the oïl runs out,when mad cow or other food-borne diseases become epidemic,when the pesticides no longer work,when drought strikes and plagues come and soils blow away-we'll still have a way to feed ourselves.-Michael Pollan