"African policymakers need to steer urbanisation from its current non-sustainable path towards healthier cities that ensure food and nutrition security, decent work and income, and a clean environment for all their citizens, " says the FAO's Modibo Traore.

BBC: Africa: Feeding the rising urban population

"These stories which hit honest, decent, salt-of-the-earth folk like the Pattons and those who work for them, hit us all hard, " he said.

BBC: Building site