Stock Photo - Beate and Christian Kewitsch stand on the balcony of their ""House of the Future"" with their children Caroline and Juliane (L) in Bottrop, Germany, 18 July 2013. The totally normal looking single family home built in the 1960's has been converted to a plus energy house with photo voltaic power and solar heating, the electric car outside is charges with surplus power. Photo: ROLAND WEIHRAUCH | usage worldwide. - Bottrop/North Rhine-Westphalia/Germany

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