Kenyan conservationist Richard Leakey dies aged 77

Kenya's president pays tribute to the late conservationist Richard Leakey, who has died aged 77. Leakey spent his life defending his country's endangering wildlife. Also, we sample the pan-African offerings of award-winning experimental chef Dieuveil Malonga at his Kigali restaurant. And the Great Green Wall struggles to flourish, but dozens of gardens have already sprung up in the Senegalese desert.