The main environmental concerns associated with refrigerant disposal are ozone depletion and global warming. Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) contribute to ozone depletion, while hydrofluorocarbons (HFCs) are potent greenhouse gases with high global warming potential (GWP). Improper handling and disposal of refrigerants can lead to their release into the atmosphere, exacerbating these environmental issues.