(H)CFCs are ozone depleting substances (ODSs) and have been successfully been phased out under the Montreal Protocol. As a result, the abundance of ODSs in the atmosphere has declined and the ozone layer is expected to recover. CFCs also had higher Global Warming Potentials (GWPs) than the HFCs replacing them. As such, by replacing CFCs by HFCs, the refrigeration and air-conditioning industry and other users not only contributed to the preservation of the ozone layer, but also made a most significant and positive contribution to reducing greenhouse gas emissions.