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.

As nerves frayed and the clock ticked, negotiators from rich and poor nations were huddled in one room Saturday during overtime United Nations climate talks to try to hash out an elusive deal on money for developing countries to curb and adapt to climate ...