Ecological, biological and environmental problems in the 3rd. world still attract much attention. Explosive population growth have many places implied a huge exploitation of the natural resources which resulted in an ecological breakdown. The development projects are increasingly followed by a demand of a sustainable development and an environmental policy which socially is acceptable for the users. The solution to these problems requires integration in many fields - especially the biological and the social scientific knowledge. The combination aims especially at a career within public and private development organisations.