Theo Leggett meets Nico Rosberg, who found fame and fortune in the fossil-fuelled world of F1, but is now reinventing himself as a champion of green technology. As a driver he reached the pinnacle of world motorsport, taking the F1 title in the final race of 2016, and then retired just days afterwards. Nico tells Theo just what it takes to become a world champion in the white heat of motorsport and how those skills are now being used on a new mission, to protect the planet. Presenter/producer: Theo Leggett (Photo: Nico Rosberg celebrates in 2016. Credit: Getty Images)