All of the following are causes of desertification except:DeforestationBiodiversityOvergrazingOver-irrigation

To determine which of the options is not a cause of desertification, let's analyze each of the provided choices:

1. Deforestation: This refers to the clearing of trees, which can lead to soil erosion and reduced moisture retention, contributing to desertification.

2. Biodiversity: Higher biodiversity often helps maintain soil health and ecosystem stability. Loss of biodiversity can be a concern, but biodiversity itself is not a direct cause of desertification; rather, it can help prevent it.

3. Overgrazing: This occurs when animals graze too much vegetation, leading to soil degradation and promoting desertification.

4. Over-irrigation: Excessive irrigation can lead to salinization of soils, which can contribute to land degradation and thus desertification.

Final Answer

Biodiversity is the only option that is not a cause of desertification.