Africa , African , BURKINA , CDREF00224 , DEVELOPED , DROUGHT , FASO , HORIZONTAL , Sahel , Sahelian , Third World , WORLD , arid , dead , desert , desertification , destruction , developing countries , developing country , dying , earth , ecosystem , ecosystems , environment , environmental , eroding , erosion , habitat , habitats , horizontals , issue , issues , livestock , overgraze , overgrazed , overgrazing , ow_edwards , pmscinternational , rural , soil , tree , trees