Nearly 200 nations have reached a deal, announced Saturday morning after all-night negotiations, to limit the use of greenhouse gases far more powerful than carbon dioxide in a major effort to fight climate change. The talks on hydrofluorocarbons, or HFCs, were called the first test of global will since the historic Paris Agreement to cut carbon emissions was reached last year.
Environmental groups had hoped that the deal could reduce global warming by a half-degree Celsius by the end of this century. This agreement gets about 90 percent of the way there, said Durwood Zaelke, president of the Institute for Governance and Sustainable Development. Zaelke's group said this is the "largest temperature reduction ever achieved by a single agreement."