Which statement about the Montreal Protocol is most accurate?

• A. It focuses primarily on eliminating all greenhouse gases.
• B. It aims to phase out ozone-depleting substances.
• C. It bans all plastic products.
• D. It regulates only CO2 emissions.

Answer: (B)

The Montreal Protocol is centered on protecting the ozone layer by phasing out substances that deplete ozone, such as chlorofluorocarbons and halons. It isn’t a broad push to eliminate greenhouse gases, it doesn’t ban plastics, and it isn’t limited to regulating just CO2 emissions. The protocol sets concrete schedules and mechanisms to reduce and eventually stop the production and use of ozone-depleting substances, with amendments to add more chemicals and assist countries in meeting the timelines. This focus on eliminating substances that harm the ozone layer is why the statement about phasing out ozone-depleting substances is the most accurate description.