Dr. McWilliams is right on the mark here and throughout his book. It's clearly true, and solid science clearly shows, that factory farming is not sustainabile and is an utter waste of water, land, other resources, and of course, the lives of billions of animals. The award-winning documentary "Cowspiracy" is a great source for viewing these data objectively.
When read with an open mind, I think that "The Modern Savage" could be a game-changer, especially for those who have resisted making changes to their meal plans concerning whom, not what, they're eating, because they were unaware of the ecological and ethical issues or because they wrote them off as being sensationalist - radical - fiction. They're not. One surely can have a very wholesome, good, and active life beyond beef and after meat.