Which treaty bans ozone-depleting substances like CFCs?

• A. Kyoto Protocol
• B. CERCLA
• C. Clean Water Act
• D. Montreal Protocol

Answer: (D)

The Montreal Protocol bans ozone-depleting substances like CFCs. It was adopted in 1987 to protect the stratospheric ozone layer by phasing out the production and consumption of CFCs and related chemicals, with amendments that accelerated the phaseouts over time. This makes it the best choice because it directly targets the chemicals responsible for ozone depletion and provides a clear international framework for compliance and support. The other treaties address different issues: the Kyoto Protocol focuses on reducing greenhouse gas emissions to combat climate change, CERCLA deals with cleaning up hazardous waste sites, and the Clean Water Act regulates pollutants in U.S. waters.