"Allan Savory's holistic resource management [was described] as a "promising option," even though there is no science to back up claims about intensive grazing schemes. The truth is that grasslands are relatively arid environments, and livestock don't make the grass grow: rain does. And rain doesn't follow the hoof."
--Jeff Burgess, reader response in the November/December 2013 Nature Conservancy magazine
Addendum: read this comprehensive response to Allan Savory's claims, or this recent direct rebuttal:
The Savory Method can not green deserts or reverse climate change, Briske, David D., Bestelmeyer Brandon T., Brown Joel R.,Fuhlendorf Samuel D., and H. Polley Wayne , Rangelands, Volume 35, Issue 5, p.72-74, (2013)
and this follow-up: