Which of the following activities will lead to deterioration of the environment?

Overgrazing will lead to deterioration of the environment. Overgrazing happens when there are too many animals grazing on a particular piece of land. As a result, the vegetation is unable to regenerate and soil erosion occurs, which can lead to desertification. This leads to the destruction of the natural habitat, loss of biodiversity and decreased soil fertility, which in turn affects agriculture and food production. On the other hand, activities such as planting of trees, contour ploughing, afforestation and creation of shelter belts help in conserving the environment by preventing soil erosion and improving soil fertility.