aridity distribution desertification arid trockengebiete humid klimawandel landnutzung joint observed erde land drylands semiarid regions groundwater subtypes globale livestock trocken
risk desertification india human change induced map environmental world areas desert companies deserts climate issues places worst course man made
desertification map africa risk areas shows where desert sahel water clean most world droughts agricultural land caused erosion deserts sahara
desertification drylands vulnerable global ecosystem desert assessment chart categories their japan millennium source
spatial desertification dynamics distribution
desertification climate degradation drought risk climates threats role vulnerability deforestation risks evidence convergence