In what section does Michael Pollan begin to talk about agribusiness?

The entire book The Omnivore's Dilemma is really about agribusiness and how humans eat in relation (or without relation) to this subsistence strategy. From the first page of text, Michael Pollan begins to talk about the changes of the last century or so which have affected the way Americans eat. Much of this change was in favor of big-business agriculture, which promises more food, more efficiently. Though he does not use the word "agribusiness," Pollan begins to discuss industrialized food culture in the introduction.

Pollan looks much more deeply into industrialized food or agribusiness within Part I. He looks at the history of Zea mays, or corn, and follows corn on the journey it often takes in the United States today. Historically, corn was grown throughout the Americas on small-scale subsistence farming plots. Today, much of the corn grown in the United States is grown on a massive scale, in fields miles wide. The corn may wind up on your dinner table, be fed to livestock, or even be turned into fuel. This one plant fuels much of the rest of the engine of agribusiness.