Focusing on the Brazilian city of Curitiba, this inspirational documentary portrays a place where environmental problems have been swiftly met with cost effective solutions for the last 40 years. Following the screening, urban planner and three-time mayor of Curitiba Jaime Lerner discusses the simplicity of his town planning ideas. The former mayor delivers an impassioned address on the benefits of eco over ego architecture, the necessity of listening to your people, and what should be done with so-called ‘complexity sellers’. Witty and engaging throughout, Lerner’s thinking provides a welcome respite from conventional ideas of bureaucratic policy and offers a cost effective environmental model that could be replicated in cities the world over. Champion of Open Source Design, Scott Burnham and OBE of CrunchLab Peter Jenkinson ask the questions.