Bill Gates speaks to Manuela Saragosa about the future of Africa and the urgent need for the world to invest in the continent's exploding youth population.

It comes as the billionaire philanthropist and Microsoft founder launches the second annual conference in New York of his Goalkeepers initiative - a network of activists from across the world who aim to ensure that their governments fulfil the UN’s 17 Sustainable Development Goals.

But why is it that the number of children born per woman in Africa remains so stubbornly high? We ask Olufunke Baruwa, a gender and development practitioner in Africa's most populous nation, Nigeria. And are the attempts of wealthy outsiders to solve Africa's problems misguided? Teddy Ruge, an outspoken Ugandan activist and entrepreneur, tells us it's time to let a new generation of Africans take over the controls.

Producer: Laurence Knight

(Picture: Bill and Melinda Gates introduce the 2018 Goalkeepers event at the Lincoln Center on in New York; Credit: Ludovic Marin/AFP)