A hydrochlorofluorocarbon (HCFC) is any organic compound that contains fluorine, chlorine, hydrogen and carbon atoms, and that has at least one hydrogen attached to a carbon bonded to a fluorine atom. HCFCs are a class of haloalkanes that are used as refrigerants, solvents and foam-blowing agents. They were introduced as a replacement for chlorofluorocarbons (CFCs), which were found to damage the ozone layer. HCFCs are less damaging to the ozone layer than CFCs, but they are still greenhouse gases and contribute to climate change. The Montreal Protocol on Substances that Deplete the Ozone Layer calls for the phase-out of HCFCs by 2030.