Research suggests that creating an artificial dust layer could rapidly cool the planet. But is it practically deliverable and what would be its unintended consequences? Could this radical idea be part of the solution or is this just a dangerous distraction from emissions cuts?
Dr Peter Irvine: Lecturer in Climate Change and Solar Geoengineering, UCL
Prof Matthew Watson: Professor, Volcanoes and Climate, Bristol University
Inderpaul Johar: Founder, Dark Matter Labs, Building next generation institutions for climate transition
Deborah Cohen: Former Executive Editor Science Radio at BBC