Transport makes up nearly 40% of the average UK household's carbon footprint (with wide variation between different sections of society). While other sectors have made progress on cutting carbon, the dial has barely moved on transport emissions. So is the elephant in the room actually an SUV? Joining the team this time are Professor Iain Docherty, transport policy expert at the University of Stirling, Dr Debbie Hopkins, Associate Professor in sustainable urban development at the University of Oxford, and Leo Murray, director of innovation at climate change charity Possible.