Photographer Doris Derby. Composer Emily Hall. What's behind the success of TikTok?

We hear about the impetus to chronicle the civil rights struggle in 1960s Mississippi from photographer Doris Derby Women will be disproportionally affected by climate change. But they’re also at the forefront of campaigning against it. One of the most famous, Greta Thunberg, was in Bristol last week addressing crowds of young people. But have things changed since her first school strike in 2018? According to a new book, ‘Our House is on Fire – Scenes of a Family and a Planet in Crisis’, they are but not nearly fast enough. What might motivate governments and people to truly act? Composer Emily Hall will be telling us about the inspiration behind her piece for the Seven Ages of Women a new commission by Radio 3 to mark International Women’s Day on Sunday. And we look at the huge success of TikTok the free social media app where users create, share and watch videos and ask; Why is it so popular among teenagers? Presenter Jenni Murray Producer Beverley Purcell Guest; Doris Derby Guest; Emily Hall Guest; Professor Alice Larkin Guest; Dr Alexa Spence Guest; Sarah Manavis Guest; Elizabeth Wosho