As Africa grapples with the question of food insecurity, biotechnology buffs seem to have an answer: genetically modified crops that could feed a continent vulnerable to famine and food deficits. But environmentalists warn of new dangers. An appeal board recently overturned opposition from the South African GMO Executive Council to allow testing of a nutritionally enhanced, genetically modified sorghum, known as 'Super Sorghum' in greenhouses in Pretoria.