How will technology help to solve the world’s increasing need for food? By 2050 we’ll need to feed another two billion people worldwide, and the appetite for protein in many developing nations is soaring. Jane Wakefield reports from the TEDGlobal conference in Arusha in Tanzania, Among those offering solutions is Sara Menker, founder and chief executive of Gro Intelligence, an agricultural data technology company, who says that by 2027 the world could face a 214 trillion calorie deficit. And Kenyan farmer and tech entrepreneur Su Kahumbu Stephanou, who explains how her iCow app has revolutionised the way farmers can track their yield and livestock. Plus, why comedy is a serious business if you are a Zimbabwean stand up. Carl Joshua Ncube tells Jane how his chosen career meant he had to leave his homeland. (Photo: A worker inspects milk cows in Nigeria; Credit: Stefan Heunis/AFP/Getty Images)