Global: Doubts over global economy return as G20 meets

Leading policymakers expressed concern on Friday about the health of the world economy even as they closed ranks behind the euro zone's efforts to tackle a debt crisis that has rattled global markets. Speaking before two days of talks bringing together the world's top 20 developed and emerging economies, South African Planning Minister Trevor Manuel said he could not think of a more challenging time than the present for the Group of 20.