- A An international agreement specifically aimed at reducing global CO2 emissions from industry
- B An international treaty (1987) to phase out substances that deplete the ozone layer, primarily CFCs
- C A multilateral treaty establishing protected reserves specifically for global biodiversity conservation
- D A national pollution control law that specifically governs river and stream water quality
Correct answer: B. An international treaty (1987) to phase out substances that deplete the ozone layer, primarily CFCs
Explanation: The Montreal Protocol (1987) is an international treaty signed by 197 nations to phase out ozone-depleting substances (CFCs, HCFCs, halons, methyl bromide). It is considered the most successful environmental treaty; the ozone hole is slowly recovering as a result.
Concept context
Pollution, global warming, ozone depletion, deforestation, and sustainability. Important for NEET and general awareness.