The U.N.'s climate chief called on leaders of the world's biggest economies on Saturday to send a signal of support for global climate finance efforts when they meet in Rio de Janeiro next week, to help trigger a deal at COP29 talks.

Azerbaijani leader Ilham Aliyev has been praising fossil fuel and taking shots at geopolitical rivals, casting a cloud over the climate summit.

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.

Countries at the COP29 summit tried to make progress on how to raise up to $1 trillion in climate finance for the world's most vulnerable, as political tensions overshadowed the talks and Argentina on Thursday pulled its delegation from Baku.

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.

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