in just six years, professor legesse negash and local villagers have transformed a severely eroded terrain by planting indigenous trees and plants. almost miraculously, a clear flowing stream has emerged where once there was a muddy trickle. how is it that it's possible for you to get the stream flow thughout e year? >> it is because of the vegetation cover, which has been regenerating on this mountain. this water is maintaining the landscape because as soon as rain falls on the canopy, on this vegetation, that rain then infiltrates gradually to the ground, ending up with this steady flow of this river. water is life. without water, nobody can do anything. i'm amazed as short as five years--six years, you get clean water like this provided you work hard for restoring this degraded landscape. >> about a 1,000 kilometers further north in the village of abraha atsbeha, another near miraculous phenomenon is occurring. farmers are finding water at the bottom of their wells, despite the poor rains this year. the famine of 1984 struck the people of this valley very hard. many migrated, many died.