Africa cocoa crops threatened by Sahara sand

The price of chocolate could get more expensive because a seasonal weather event is threatening to damage the cocoa crop in West Africa. Farmers in Ivory Coast and Ghana supply 70% of the world's cocoa and experts fear they are not prepared to deal with the affect of Harmattan winds. The annual weather cycle brings winds from the Sahara Desert, carrying sand which can settle as a blanket of dust on cocoa plantations, decimating crops. This year there are signs the Harmattan could be more harmful than usual. Doug Hawkins, from Hardman and Co, is an expert on African agriculture. He tells the BBC's Russell Padmore about the challenges facing the cocoa sector.