Washington  — The Environmental Protection Agency (EPA) on Monday proposed a rule to slash the use of a potent climate-warming gas commonly used in refrigerators and air conditioners by 85% over the next 15 years, a move it said will play a big part in US plans to halve its greenhouse gas emissions this decade.

The proposal to curb the use of hydrofluorocarbons (HFCs) would keep the equivalent of 900-million tonnes of carbon dioxide emissions from reaching the atmosphere over that period, it said, a climate impact similar to preventing the combustion of a trillion tonnes of coal...

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