I remember being blown away by that video but apparently there has been some criticism of Savory's work. Searching his name returns a few critical articles such

I remember being blown away by that video but apparently there has been some criticism of Savory's work. Searching his name returns a few critical articles such as this one: https://www.sierraclub.org/sierra/2017-2-march-april/feature/allan-savory-says-more-cows-land-will-reverse-climate-change https://www.sierraclub.org/sierra/2017-2-march-april/feature... He has responded to some of them and sticks to his claims. It seems the picture is very complicated and we haven't figured it out just yet.