What does the Montreal Protocol 2010 primarily ban the use of?

The Montreal Protocol, adopted in 1987 and modified in subsequent years, primarily aims to protect the ozone layer by phasing out substances that deplete it. The 2010 amendment specifically focuses on the phase-out of hydrofluorocarbons (HFCs), which are potent greenhouse gases, but it builds upon previous agreements that addressed chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs).

CFCs were among the first substances targeted for elimination due to their severe impact on ozone layer depletion. While the 2010 amendment plays a crucial role in phasing down HFCs, the foundational purpose of the Montreal Protocol was primarily to ban CFCs. As such, recognizing the historical context of the protocol helps clarify its original intent to reduce substances like CFCs that harm the ozone layer significantly.

HFCs are indeed addressed in the later adaptations to the protocol, which reflects its evolving nature in response to new scientific findings regarding global warming potential. PFOS (perfluorooctane sulfonate) is not directly related to the Montreal Protocol, as it pertains more to other environmental agreements related to persistent organic pollutants.

Therefore, while the 2010