The plea, made in a letter to G20 leaders from UN Framework Convention on Climate Change Executive Secretary Simon Stiell, comes as negotiators at the COP29 conference in Baku struggle in their negotiations for a deal intended to scale up money to address the worsening impacts of global warming.

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

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.

A group of conflict-affected countries is pushing at COP29 to double financial aid to more than $20 billion a year to combat the natural disaster and security crises facing their populations, a letter seen by Reuters showed.

"You owe us!" screamed a protest banner at the COP29 summit in Azerbaijan, where negotiations over how much rich nations most responsible for climate change should pay poorer ones are

Developing countries need at least $1 trillion per year by the end of the decade to cope with climate change, economists told U.N. talks in Baku, where early efforts to reach a finance deal risk being overshadowed by diplomatic rows.