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.

United Nations climate negotiators agreed on a funding formula to help developing countries cope with the effects of climate change early Sunday in Azerbaijan after two weeks of intense negotiations.

By Kate Abnett, Valerie Volcovici and Karin Strohecker BAKU (Reuters) -Developed nations should pay $300 billion a year by 2035 to help poorer countries deal with climate change, according to a new draft deal from U.