Yeah... it seems to me like the main arguments are: ethics, environmental, and nutrition, in that order. If you agree that it is acceptable to eat meat, you might still be concerned about the environment impact. As I look at the data, it seems to me like raising animals outside our factory production system is not nearly the environmental catastrophe as some would like to project. In fact, I'm inclined to believe that there may even be a net positive, depending on the practices. The problem is, those practices don't yield cheap meat, so they often get discarded as impractical.