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Die Nutzung der Sonne - Prof. Robert Pitz-Paal über Solarenergie
Flugzeuge, die mit Hilfe von Sonnenlicht fliegen - durchaus realistisch und keine Vision einer fernen Zukunft, meint Prof. Pitz-Paal, Direktor des Instituts für Solarforschung, im Gespräch mit Leslie Rowe