AP Explains: What the new global climate agreement means

JOHANNESBURG (AP) -- tExperts say cutting hydrofluorocarbons, or HFCs, is the fastest way to reduce global warming. The United States, the world's second-worst polluter, is among the countries that want to quickly phase out the use of HFCs, and now it is bound to take the earliest action, starting by 2019. Here's a look at what it all means....

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