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The Montreal Protocol is responsible for global phaseout of the consumption and production of ozone-depleting substances (ODSs), e.g., chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). Hydrofluorocarbons (HFCs), which do not destroy stratospheric ozone, were considered long-term substitutes for ODSs and are not controlled by the Montreal Protocol. However most HFCs are potent greenhouse gases. With no impending global controls on HFCs, inclusion of HFCs under the Montreal Protocol offers a path to preserve the climate benefits already achieved by this protocol. [Source: Science / AAAS]
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