[Living without atomic power? Carl Friedrich von Weizsäcker as expert in the nuclear energy debate of the 1970's].

Carl Friedrich von Weizsäcker crossed the boundaries separating science, politics and the public sphere. In this he was led by the conviction that scientists in the modern 'technical age' are responsible for consequences resulting from their applied knowledge. Weizsäcker tried to introduce his knowledge into the policy process by advising politicians or by using the public sphere, thus applying pressure on politics. This was not only true for the 'Göttinger Erklärung' in 1957 but also for his engagement in the nuclear energy debate of the 1970s. Influenced by the 'Limits to Growth' discourse, Weizsäcker more and more gravitated towards an ecological world view and increasingly questioned material growth as well as a techno-scientific based understanding of progress. Weizsäcker thought about risks of the technical age in general and of the use of nuclear energy in particular. In the light of a growing fragmentation of scientific authority, Weizsäcker revealed uncertainty as he became fully aware that expertise cannot be based on scientific reason and cannot code the problems in terms of truth, but is inextricably linked with value spheres and contingencies. Nevertheless, his expertise was utilized as he encouraged parts of the Social Democratic Party (SPD) around Erhard Eppler to think about alternatives in energy policy.