Which brought me to my question that Corn is the #1 direct consumer of nitrogen. So unless livestock is consuming an awful lot of Corn, reducing the livestock h

Which brought me to my question that Corn is the #1 direct consumer of nitrogen. So unless livestock is consuming an awful lot of Corn, reducing the livestock headcount isn't going to reduce the amount of Corn per se. That's probably true, as the corn industry, at least in the US, will find another consumer for its quantities (since, if Pollan's research is to be believed, the corn industry and the government essentially created and supported the market that exists now).