On World Food Day we consider how changing weather patterns due to climate change are worsening Nigeria's food insecurity. BBC journalist Mohanad Hashim's emotional return to the city of his birth, Omdurman in Sudan, 18 months after the war started And efforts to save the Yaaku language which is at risk of extinction in Kenya. Presenter: Charles Gitonga Producers: Nyasha Michelle, Patricia Whitehorne, Yvette Twagiramariya, Blessing Aderogba, Nour Abida and Paul Bakibinga Technical Producer: Francesca Dunne Editors: Andre Lombard and Alice Muthengi