Revolution auf dem Wasser - Wie kann die Schifffahrt grün werden?

Photo © ARTE France / Michael Kern

Photo © ARTE France / Michael Kern

Photo © ARTE France / Michael Kern

Photo © ARTE France / Michael Kern

Photo © ARTE France / Michael Kern

Photo © ARTE France / Michael Kern

Photo © ARTE France / Sven Kiesche

Photo © ARTE France / Sven Kiesche

Photo © ARTE France / Sven Kiesche

Photo © ARTE France / Erik Sick