Negotiations over a global treaty on microplastics have broken down. So, where to from here for one of the world's biggest environmental threats? We also get an update on new efforts to clean-up the cement production industry; and we look at AI chatbots and the increasing role they're playing as sources of advice and emotional support.GuestsDr Pratik Sachdeva — Senior Data Scientist, D-Lab, University of California, BerkeleyDr Shababa Selim — Senior Technology Analyst, IDTechEXProfessor Paul Fennell — Professor of Clean Energy, Imperial College LondonProfessor Jill Newby — Clinical psychologist, The Black Dog Institute, University of New South Wales

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