What is the goal of the Montreal Protocol?

The goal of the Montreal Protocol is to phase out ozone-depleting substances. This international treaty, which was adopted in 1987, specifically targets chemicals such as chlorofluorocarbons (CFCs) and halons, which are known to contribute to the depletion of the ozone layer. The ozone layer is essential for protecting the Earth from harmful ultraviolet (UV) radiation, which can lead to increased health risks, such as skin cancer, as well as harmful effects on ecosystems. The successful implementation of the Montreal Protocol has led to a significant reduction in the production and consumption of these substances, resulting in the gradual recovery of the ozone layer.

The other options do not align with the primary focus of the Montreal Protocol; it does not explicitly aim to enhance air quality standards, regulate vehicle emissions, or increase tree cover globally. Each of these issues is important for environmental protection, but they fall outside the specific objectives of the treaty.