Dogon children manually irrigate the onion culture on the plateau near the village of Benimato, west Mali, February 4, 2007. The Dogon are traditional farmers and both adults and children are very industrious, as work is a central feature of Dogon society. The U.N. estimates that due to rural depopulation, by the year 2030 over half of Africa's 700 million people will live in towns. Picture taken February 4, 2007. To match feature MALI-AGRICULTURE/ REUTERS/ Florin Iorganda (MALI)