The biggest impacts of active sand dunes in the Colorado Plateau region would be on the Navajo and Hopi people, whose reservation land is either on, or downwind of, the largest areas of sand dunes. Many Navajo and Hopi homes are on or near sand dunes; reactivation of dunes would obviously have a negative effect on living conditions. Sheep and cattle are important to the economy of the Navajo and Hopi, and much of the vegetation required for grazing is dune vegetation. In addition, dry farming is practiced in much of the area, some of it on sand dunes. Thus, reactivation of sand dunes in the area would have serious impacts on living conditions, grazing, and farming.