Image courtesy Juliano Ribeiro Salgado.
There is a well-known series of images of an open cast mine with a sea of people climbing up and down ladders, extracting soil by hand. It is the work of Brazilian photographer Sebastio Salgado.
Filmmaker Wim Wenders is a huge fan of Salgado and has co-directed a film about his life and work called The Salt of the Earth, nominated for Best Documentary at the 2015 Academy Awards.
The other director is Salgado's son – filmmaker Juliano Salgado, who joins Wallace Chapman to talk about the new movie.