Editor’s note: After this story was posted, delegates at the U.N. Climate Summit resumed negotiations into the early hours of Saturday morning and the body eventually came to a consensus to recognize the deal outlined in the story below.

COPENHAGEN–The U.S., China, India and South Africa form the core of a growing group of nations that have agreed upon a commitment to combat climate change , concluding a grueling two weeks of negotiations in the Danish capital here as part of the United Nations’ climate summit. The so-called "Copenhagen Accord" will not be legally binding but will list in annexed documents, for the first time, commitments from both developed and developing countries to reduce emissions of greenhouse gases . [More]