The plea, made in a letter to G20 leaders from top U.N. climate official Simon Stiell, comes as negotiators at the COP29 conference in Baku struggle for a deal intended to scale up money to address the worsening impacts of global warming.

The UN's climate chief urged G20 leaders on Saturday to push COP29 talks towards a deal to raise money for developing nations as diplomats struggled to find common ground in marathon negotiations.

U.N. climate chief Simon Stiell appealed for leaders of the Group of 20 nations, which includes the world's biggest economies and top polluters, to weigh in when they meet in Brazil on Monday.

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.