In contrast, the Montreal Protocol is designed to top-down phaseout the production and consumption of ozone-depleting substances (ODS) – such as chlorofluorocarbons (CFCs, halons, hydrofluorocarbons (HCFCs), and methyl bromide; and phasedown  the production and consumption of ozone-safe hydrofluorocarbons (HFCs).
This approach differs from others in that it targets the reduction of ozone-depleting substances (ODS) – including chlorofluorocarbons (CFCs, halons, HCFCs), and aims to decrease the production and consumption of safer alternatives such as hydrofluorocarbons (HFCs).