"Comfortably Unaware explains, so clearly, how what we choose to eat has a direct impact on the health of Planet Earth: how modern agro-business and our thoughtless appetites are, quite literally, destroying the environment and the future of our children. I urge you to read it, to think about its message, discuss it with your friends – and start to change the world, one bite, one meal, one diet at a time." -- Jane Goodall, PhD, DBE, UN Messenger of Peace.
I just stumbled across Dr. Richard Oppenlander of http://comfortablyunaware.com.
On December 5th 2011, he uploaded a whole series of lectures. The first one I saw was The myth About Grass-fed Beef: Is it Sustainable?
Personally I think if you have time it is not a bad thing to watch and read this sort of thing to understand the other side of the ongoing conversation. There are I know already loads of posts about sustainability, and I know this is not a direct question, but I thought it might be a useful post for archives sake.