desertification
noun [ U ] environment specialized uk/dɪˌzɜː.tɪ.fɪˈkeɪ.ʃən/ us/dɪˌzɝː.t̬ə.fəˈkeɪ.ʃən/
沙漠化，荒漠化
the process by which land changes into desert, for example because there has been too much farming activity on it or because a lot of trees have been cut down