This article, albeit long, is a really interesting read. It was included in his book The Omnivore's Dilemma. He battles for both sides of the argument. I still refer to his points about animal's having the capacity to suffer. I am not a vegetarian (anymore) but I do believe in raising animals in a way that is deserving of them giving up their lives for our use.
An Animal’s Place | Michael Pollan
An Animal’s Place | Michael Pollan