Impacts of Recent Climate Trends and Human Activity on the Land Cover Change of the Abbay River Basin in Ethiopia oleh Asaminew Abiyu Cherinet, Denghua Yan, Hao Wang, Xinshan Song, Tianlin Qin, Mulualem T. Kassa, Abel Girma, Batsuren Dorjsuren, Mohammed Gedefaw, Hejia Wang, Otgonbayar Yadamjav