In this episode of Clear The Air, Sadiq Khan speaks to Yvonne Aki-Sawyerr, Mayor of Freetown in Sierra Leone and Steering Committee member of C40 Cities, a global network of mayors taking urgent climate action. Yvonne describes her journey to be the first woman elected Mayor of Freetown in decades. She tells Sadiq about her work to transform the capital, why green solutions are top of her agenda, and how cities across the world can help achieve climate justice.