Which of the below is true regarding desertification?
a. it is likely to happen in any type of climate
b. it produces rich desert ecosystems
c. it is not usually impacted by droughts or climate change
d. it can happen as a result of non-sustainable agriculture

The correct answer is D. Desertification can happen as a result of non-sustainable agriculture.

Explanation:

Desertification is a process of ecological degradation in which the fertile and productive soil loses all or part of the production potential. This happens as a result of deforestation and destruction of the vegetation cover, the subsequent erosion of the soils, the overexploitation of aquifers, the over-irrigation and consequent salinization of the lands or the lack of water; human beings frequently favor and increase this process as a result of activities such as excessive cultivation and grazing or deforestation. According to data from the United Nations Environment Program (UNEP), 35% of the surface area of continents can be considered as desert areas, within these territories millions of people survive in conditions of persistent drought and food shortages. Among many other factors, it is considered that the expansion of these deserts is due to human actions.

it restores trees to areas where they once grew.