Diplomatic tensions over global warming will take center stage at the G20 summit in Brazil this week, as negotiators at U.N. talks in Azerbaijan hit an impasse on climate finance that they hope leaders of the world's 20 major economies can break.

World leaders attending the G20 Summit pose for a group photo in Rio de Janeiro, Tuesday, Nov. 19, 2024. (AP Photo/Silvia Izquierdo) A sign announces the G20 Summit in Rio de Janeiro, Brazil, Monday,

With leaders from the world's biggest economies converging on Rio de Janeiro for a two-day G20 summit starting Monday, the usually relaxed seaside city is under a tight security blanket.Many locals were planning to leave the city of six million during the summit.