The Baku accord requires developed countries, historically responsible for most planet-heating emissions, to pay at least $300 billion every year by 2035 to help poorer countries transition to cleaner energy and adapt to global warming.

A final text was released early Sunday following several sleepless nights for negotiators, with tensions boiling over as small islands states and the world's poorest countries walked out of one meeting.

Cop29 ground out a last-minute compromise deal on Saturday night that offers at least $300 billion (£240 billion) per year by 2035 to help poorer countries confront global warming and allows China’s contributions to remain voluntary.