Guardian: Fifteen years years ago the villages around Abrha Weatsbha in northern Ethiopia were on the point of being abandoned. The hillsides were barren, the communities, plagued by floods and droughts, needed constant food aid, and the soil was being washed away. Today, Abrha Weatsbha in the Tigray region is unrecognisable and an environmental catastrophe has been averted following the planting of many millions of tree and bush seedlings. Wells that were dry have been recharged, the soil is in better shape,...