JIJIGA, Ethiopia — The land here used to speak. At dawn in Kebribeyah district, Somali Regional State, eastern Ethiopia, the plains stretch wide beneath a pale sky, with dusty shades of brown and yellow broken by thorny acacia trees and the slow movement of livestock across the horizon. For generations, pastoralists learned to read the landscape. The arrival of seasonal winds, the timing of the rains, and the alignment of stars all carried meani…