If you haven't seen it already, check out... The Meatrix...

It's certainly a entertaining animation but I think it's a bit exaggerated. I know there are farms like this and they do the polluting that they do but I don't thinks quite as bad as they suggest. It is possible to buy eco friendly, animal friendly produce and meet. If your willing to pay some extra cash for it. Still I would like to see evil agro-businesses go away.