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.

Negotiations were deadlocked Saturday at the midway point of the UN climate summit, with hopes pinned on G20 leaders intervening to strike a critical finance pact at the crunch talks.

Half way through the UN climate conference, the UN climate chief looked ahead to the gathering of the Group of 20 (G20) powers and issued a dire warning about the outlook for the globe unless changes are made.

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.

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