“Restorative grazing” is the idea that by appropriate use of grazing on dry grasslands, you can build up organic matter and improve the land to increase the health of the plants there, even during droughts.  In this article from the Food and Environment Reporting Network, a 7-year study of a desertified landscape in Zimbabwe looked at how using managed grazing has improved the health of the landscape and allowed the residents to increase their food supply.

Source: Neelix, Commons Wikimedia
Source: Neelix, Commons Wikimedia