The project "From 'The Blue Sky above the Ruhr' to the Energiewende" aimed at shedding light to the factors that have driven the development of scientific environmental policy advice in Germany. The project team applied the "oral history method", holding a total of 20 interviews with contemporary witnesses. Ecologic Institute produced the project website which provides an overview of the goals, methods and partners of the project. The project's findings as well as videos of the interviews are available for viewing in the media library.