When a frustrated farmer dumped a bag of VHS video tapes onto the desk of Cincinnati lawyer Rob Bilott it kick-started a legal process that would ultimately reveal that one of the world’s biggest chemical companies had poisoned thousands of people. The story of DuPont and their manufacture of the non-stick chemical family PFAS matters to the factory workers of Parkersburg, West Virginia but it also reveals the extent to which virtually all of us have been exposed to a chemical that for decades has lined our frying pans and takeaway food containers and guarded our sofas and carpets against stains.

Rob’s story of his two decade battle with DuPont has inspired 'Dark Waters', a Hollywood film starring Mark Ruffalo and Anne Hathaway. In the first of a new series Tom Heap meets Rob and Mark to discuss the impact on the environment and human health of a family of chemicals that can build up in our bodies and take tens of thousands of years to decay.

Producer: Alasdair Cross