Which one of following does not cause desertification?

Restricted grazing.

The degradation of natural resources can occur, not just by the action of pollutants but also by improper resource utilisation practices.

Soil erosion and desertification: The development of the fertile top-soil takes centuries. But, it can be removed very easily due to human activities like over-cultivation, unrestricted grazing, deforestation and poor irrigation practices, resulting in arid patches of land.

When large barren patches extend and meet over time, a desert is created. Internationally, it has been recognised that desertification is a major problem nowadays, particularly due to increased urbanisation.