By 1940, the percentage of the population on farms fell to 23 percent, and by 1980 it had dwindled to 3 percent. In and of itself, this population shift might not have been a bad thing, but it was accompanied by another terrible cost. A way of life became simply a means of production. Human husbandry gave way to the industrial exploitation of land. Left behind was the knowledge of how to care for land, so plainly evinced in today’s problems of soil erosion and in pollution from chemical pesticides and fertilizers.