Pay now to help poorer countries cope with climate change or pay more later, negotiators were warned on Thursday as experts said poor states need at least $1 trillion per year by the end of the decade to move to greener energy and protect against extreme weather.

The US election victory of Donald Trump - a known climate sceptic - could also prove to be a distraction, and some important leaders are not attending. COP29 is the world's most important meeting on climate change. It is led by the UN, and the 2024 event, the 29th such gathering, runs from 11-22 November.

Money is a central focus of the climate talks being held in Azerbaijan and the success of the summit is likely to be judged on that goal.