Question: what are cfcs and hfcs?
Answer: What are HFCs and how are they different from CFCs? Hydrofluorocarbons (HFCs) are greenhouse gases containing carbon, hydrogen, and fluorine. ... Decades ago, appliances used chlorofluorocarbons (CFCs) as refrigerants, which wreaked havoc on the ozone layer and were phased out after the 1987 Montreal Protocol.