RIO DE JANEIRO (Reuters) - Brazil launched the Global Alliance for Hunger and Poverty on Friday at the G20 Summit in Rio, a Brazilian government official said, with an initial 41 participating members pledging to lift 500 million people out of poverty through cash transfers and social protection systems.

As leaders from the world's largest economies descend on Rio de Janeiro, here's what we'll be watching. The world’s largest economies are gearing up for the Group of 20 largest and emerging economies’ summit, a two-day affair that will bring some of global development’s most pressing issues to the center stage.