Wolfgang Feist has spoken specifically about widening the use of the passive house standard, the obstacles to implementation of existing know-how, about sustainability or political measures to promote energy-efficient construction. "The cleanest energy is the energy I don't need", says Norbert Lantschner. He also speaks about passing on knowledge and experience in Italy, the scope for energy-efficient construction and the future of construction. Both interviews can be found on the website of the CIPRA climalp Project - energy-efficient building from regional wood. Summaries and the most important statements are available for downloading in all Alpine languages and in English at www.cipra.org/de/climalp (de/fr/it/sl/en)