Besides anthropogenic productivity of the land, the biodiversity of degraded land also declines, as previously mentioned.[13] With less biodiversity, this ecosystem is less adaptable to when disasters strike it[2][3] It has a smaller available food supply, in terms of plants, for animals, who then may die out or more likely may relocate. Proof of this decline is that presently 15-20% of Tibetan Plateau species are now considered endangered; and now because of this animal and plant absence, the soil quality of these degraded lands is very poor.[4] It does not hold the necessary nutrients, such as water, nitrogen, and carbon, essential to either supporting life or inviting life back to that land.[5] As a result of such carbon and nitrogen loss in the Tibetan Plateau, $8,033/ha and $13,315/ha were respectively lost in economic terms. Soils are further weakened by dust storms whose frequency increases because of degradation.[12][6] Erosion of soil becomes a bigger problem, since no longer are there as many plants to anchor in the soil.