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Over the next thirty years Africa will experience a transformative population increase. Will it be for good or ill? It all depends on whether Africa's nations can deliver on jobs, housing and infrastructure to enable two billion people to thrive. It is an unprecedented leadership challenge. HARDtalk's Stephen Sackur speaks to former Nigerian President Olusegun Obasanjo who has just published a blueprint for African prosperity; does governance in his own country inspire confidence or scepticism?