Perfluorocarbons (PFCs) are tracked under which international agreement?

Perfluorocarbons (PFCs) are tracked under the Montreal Protocol, which was established to protect the ozone layer by phasing out the production and consumption of substances that deplete ozone. Although the Kyoto Protocol addresses greenhouse gases, including some that could have atmospheric impacts like PFCs, the focus of the Kyoto Protocol is not specifically on substances that deplete the ozone layer.

PFCs are potent greenhouse gases with significant global warming potential, but their regulation is explicitly linked to agreements aimed at controlling substances that harm the ozone layer. The Montreal Protocol's subsequent amendments have recognized the need to address PFCs due to their long atmospheric lifetimes and their ability to contribute to climate change.

The Paris Agreement focuses on limiting global temperature rise and does not specifically address the phase-out of ozone-depleting substances. The Clean Air Act is a domestic U.S. law aimed at controlling air pollution but does not provide international frameworks like the Montreal Protocol. Thus, the association of PFCs with the Montreal Protocol makes it the correct answer.