Philippe Le Gall (DEEIT) and Nicolas Pollet (POLYGNOME) came back from a land school in Gabon (3 to 13 april). This land school fostered studies on the dynamics of forest structures in mangrove, the marine and freshwater biological diversity, the dynamics of coastal and estuarian diversity, biogeography and urban management, coastal sedimentation, ecotoxicology and the problems of waste, batrachology, entomology, mammals diversity and conflicts between humans and nature.