Powerful greenhouse gases in focus at global climate meeting

Greenhouse gases that are more powerful than carbon dioxide are the focus of a global gathering this week in Africa. Experts say cutting hydrofluorocarbons, or HFCs, is the fastest way to reduce global warming. The United States is among the countries that want the world to quickly phase out the use of HFCs, and Secretary of State John Kerry is arriving Thursday to encourage a deal. Here's a look at a potential global climate agreement that has been described by the National Resources Defense Council as "the world's biggest climate protection achievement in the year after Paris."

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