Synthetic turf worsens urban heat, kills soil, harbours microbes and sends toxic pollution and micro-plastics into the environment – yet it is proliferating across Sydney schools, daycare centres and sports fields. Should it be banned? Researcher Bron Hanna and designer Dr Mick Battam in conversation with Elizabeth Farrelly. Correction: Our guest Bron Hanna incorrectly said the cost of Norman Griffith oval has blown out to $3.4 million when it is closer to $13.4 million