I found it. This is the exact interview I heard on NPR, November 1st 2009, that inspired me to quit eating meat and dairy, and ultimately, become a vegan. (Not the written article, but the audio that can be streamed or downloaded for free.) It's less than 7 minutes long. Whether you eat meat or not, I highly recommend listening to it. It will explain why the following quote from the end of the interview is so true.
"What we choose to eat when ordering in a restaurant, what we choose to buy at a supermarket, is, um, frankly the most important, or at least one of the most important decisions we'll make all day."
Jonathan Safran Foer