When people are singing and dancing on the 38th floor of the Omniturm in the centre of Frankfurt's financial district shortly after...

The Sahel has enormous potential for renewable energy, yet it is one of the regions with the greatest energy poverty in the world....

On 2 June, sustainability took us to Cologne. Ralph Schneider, Wolf-Dietrich Fugger and Timo Schäfer took part in the solar days of the...