The main environmental concerns associated with refrigerants are their contribution to ozone depletion and global warming. Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) are known to deplete the ozone layer, while hydrofluorocarbons (HFCs) are potent greenhouse gases that contribute to climate change. The phase-out of refrigerants is aimed at reducing their environmental impact and mitigating these concerns.