This is a comment on Foer's entire book, not p. 88 alone.
And does Foer tell you how wheat, soybeans and corn are harvested and how many animals and birds get chewed up by the huge reapers? Does he talk about the deforestation caused by converting land to planting acreage? Does he consider what would happen to the millions of domesticated birds and cattle that would be abandoned to starve to death slowly if Vegans had their way?

No, the one thing we can do is to support organizations like the ASPCA or The Humane Society which work to create and enforce laws against animal cruelty. They work to have those animals live in good environments and be slaughtered humanely, like not crowding them in feed lots and using an air gun to kill them so rapidly, they don't know what's happening.

You can't eat anything that's cruelty free, even vegetables, unless you grow all of your food yourself -- even then, where do you get seeds from that haven't come from plants that were seeded and harvested under cruel conditions. It's easy to point fingers. It is not easy to effect remedies. Has Foer ever heard of 'unintended consequences?' -- You do one thing to remedy a situation, but there are unforeseen consequences that are as bad as the original situation for which you've provided the solution