Countries agreed on a deal to inject at least $300 billion annually in humanity's fight against climate change, aimed at helping poor nations cope with the ravages of global warming at tense United Nations climate talks in the city where industry first tapped oil.

The world approved a bitterly negotiated climate deal on Sunday (Nov 24) but poorer nations most at the mercy of worsening disasters dismissed a US$300 billion a year pledge from wealthy historic polluters as insultingly low.

The COP29 climate summit ran into overtime on Friday, after a draft deal that proposed developed nations take the lead in providing $250 billion in annual climate finance by 2035 drew criticism from all sides.