Toxic chemicals in the New Orleans flood waters will make the city unsafe for full human habitation for a decade, a US government official has told The Independent on Sunday. And, he added, the Bush administration is covering up the danger. In an exclusive interview, Hugh Kaufman, an expert on toxic waste and responses to environmental disasters at the US Environmental Protection Agency (EPA), said the way the polluted water was being pumped out was increasing the danger to health. The pollution was far worse than had been admitted, he said, because his agency was failing to take enough samples...