Next month world leaders will again gather to focus on dealing with our global plastic problem. So this week we’re looking for solutions. Marnie Chesterton hears from Professor of Sustainable Chemical Engineering at the University of Sheffield, Rachael Rothman on how we can engineer safer, more environmentally friendly plastics.

And at the other end of the plastic spectrum, she hears about the clean up operation after the world’s biggest ocean spill of nurdles – tiny plastic pellets which are used to make plastic products. Investigative environmental journalist Leana Hosea brings the results of her investigation into the clean up after the X-Press Pearl container ship caught fire and sank 4 years ago.

Mark Miodownik, University College London Professor of Materials & Society returns to the studio with the results of a citizen science project to try to get more data on potty training. It aims to encourage parents to get toddlers out of nappies earlier.

And Penny Sarchet, managing editor at New Scientist brings her pick of this week’s newest scientific discoveries.

Presenter: Marnie ChestertonProducers: Clare Salisbury and Dan WelshEditor: Martin SmithProduction Co-ordinator: Jana Bennett-Holesworth