The Environmental Protection Agency on Monday announced a new regulation designed to sharply reduce the production and use of hydrofluorocarbons, or HFCs, a powerful class of greenhouse gases used in refrigerators, air conditioners, and building insulation. The rules marked a concrete step to cut emissions linked to climate change following President Biden's announcement 10 days ago that the U.S. would aim to reduce emissions by half over the next decade. The EPA's new regulation would aim to cut HFC production, import, and use by 85 percent over the next 15 years, beginning in 2022. HFCs trap heat in the atmosphere more efficiently than carbon dioxide, and the EPA estimates that the new regulation could cut the equivalent of 4.7 billion metric tons of carbon dioxide from the atmosphere by 2036.

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