What international agreement addresses ozone-depleting substances?

The Montreal Protocol is the international agreement specifically designed to address the issue of ozone-depleting substances. Established in 1987, this protocol aims to phase out the production and consumption of chemicals known to harm the ozone layer, such as chlorofluorocarbons (CFCs) and halons. The agreement has been successful in significantly reducing the use of these harmful substances, leading to a gradual recovery of the ozone layer.

In contrast, the Kyoto Protocol primarily focuses on reducing greenhouse gas emissions to combat climate change, while the Paris Agreement aims to limit global warming to well below 2 degrees Celsius. The Rio Declaration establishes principles for sustainable development but does not target specific pollutants or environmental issues like ozone depletion. Therefore, the Montreal Protocol is the most relevant agreement concerning ozone-depleting substances.