How do you solve a problem like CO2? As the curtain closes on the world’s most important climate summit, we talk to a scientist who was at COP 28 and is working to solve our carbon dioxide problem. Professor Mercedes Maroto-Valer thinks saving the planet is still Mission Possible - but key to success is turning the climate-busting gas, CO2, into something useful. And as Director of the Research Centre for Carbon Solutions at Heriot-Watt University and the UK’s Decarbonisation Champion, she has lots of innovative ideas on how to do this. She also has a great climate-themed suggestion for what you should say when someone asks your age… Produced by Gerry Holt