Knowledge intensification in resource-based economies / Jo Lorentzen -- The development of sugar-based plastic in Brazil / Léa Velho and Paulo Velho -- The manufacture of biodegradable plastics from maize starch : a case of technological migration, adaptation and learning in South Africa / Marian Walker -- Cleaning pollution : from mining to environmental remediation / Juana Kuramoto and Francisco Sagasti -- Missed opportunities? : a case study from South Africa's mining sector / Thomas E. Pogue -- From coffee production to machines for optical selection : a case of lateral migration in Costa Rica / Elisa Giuliani.