Brazil is pushing for concerted action to alleviate hunger as it hosts a summit of the Group of 20 leading economies amid global uncertainty over two major wars and incoming U.S. President-elect Donal

Set against a backdrop of political turmoil, it's going to be a big ask for the leading rich and developing nations to sign up to any meaningful declarations.

Brazilian President Luiz Inácio Lula da Silva has announced the launch of the Global Alliance against Hunger and Poverty at the start of the G20 summit in his country's coastal metropolis of Rio de Janeiro on Monday.