After four years of inaction, the EPA is finally regulating this superpollutant

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Carbon dioxide gets the fame and attention of the greenhouse gases. But there are others that are even more effective at trapping heat; they just exist in much smaller concentrations, so they don’t usually face the same level of scrutiny or regulation.

The United States is finally taking aim at an important type of these lesser-known superpollutants: hydrofluorocarbons, or HFCs, which are used in air conditioners and refrigerators. The Environmental Protection Agency announced a rule on Monday, first reported by the New York Times’s Lisa Friedman, that it will phase…

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