For thousands of years, we've been building boats. We began, and indeed continued for centuries, with wood, but since the mass-commercialisation of plastic since the late 1940's, we've been making boats from glass or fibre-reinforced plastics.

Building new boats this way is carbon-intensive plus there is little, if any, formal process in the world for these huge plastic hulls when they come to the end of their lives.

In this episode, we speak with Friedrich Deimann and his Co-Managing Director, Jan Paul Schirmer, of Greenboats - a German-based team with big ambitions, building boats in a cleaner and more efficient way.