Tina interviews Mirja Löhr, the director of the company Ekomo. The start-up has created a heating system that works using induction and can therefore be much more sustainable than heating with oil or gas.

Berlin's reigning mayor Klaus Wowereit is the longest reigning head of government in Germany. In this exclusive interview, he discusses the construction debacle of the new Berlin Airport and his plans for introducing social housing to Tempelhof Field. (video copyright dpa)