The United Nations’ annual climate talks are pushing into overtime under a cloud of anger and disappointment as negotiators are well short of a deal on money for developing nations to curb and adapt to climate change.

UN climate talks looked set to overrun into the weekend as a deep gulf formed between richer and poorer countries over cash to help those most vulnerable in a warming world. Wealthier nations offered to more than double to $250bn a year the cash they give developing countries annually to fight climate change.

The European Union, United States and other wealthy countries at the COP29 climate summit have agreed to raise their offer of a global finance target to $300 billion per year by 2035, sources told Reuters on Saturday.