Africa's economy isn’t growing fast enough to meet targets to reduce poverty in the world’s poorest continent, the United Nations said. Per-capita income will probably expand 2.7 per cent in 2011 and 2.8 per cent in 2012, lower than the 3 per cent 'minimum rate of growth to make a substantial dent in poverty', the UN said in a statement released in Johannesburg. Rising commodity prices, better harvests and investments in rail and energy projects will help lift growth to 5 per cent in 2011 and 5.1 per cent in 2012, from 4.7 per cent last year, the UN said.