Unfortunately there are no ...

Unfortunately there are no easy answers, and what works in one location is not necessarily the answer for the next. Over and above answers given by others, things to try are:

Prevent/limit overgrazing by livestock

Select suitable livestock, eg. donkeys create havoc to grasslands, while camels dont

Establish suitable flora if possible

Diversification of livestock and crops

In Namibia some useful work has been done by the Desert research Foundation of Namibia and the Ministry of Agriculture.

Dr Axel Rothkegel has done some useful work on the managing of grazing land, including limiting of bush encroachment and establishing the correct flora.

The City of Windhoek recycles sewerage water to drinking water standards, as well as using grey water for parks, sport fields and other green areas