Which one of the following is associated with the issue of control and phasing out of the use of ozone-depleting substances?

1. A

   Bretton Woods Conference

   (a) Bretton Woods Conference. 1944 created the IMF and World Bank. It has nothing to do with ozone-depleting substances.

2. B

   Montreal Protocol

   (b) Montreal Protocol. The 1987 Montreal Protocol on Substances that Deplete the Ozone Layer is the treaty for controlling and phasing out ODS (CFCs, halons, and later HCFCs). That is the official key.

3. C

   Kyoto Protocol

   (c) Kyoto Protocol. 1997 UNFCCC protocol on greenhouse-gas emission targets, not the ODS phase-out treaty.

4. D

   Nagoya Protocol

   (d) Nagoya Protocol. 2010 protocol on access and benefit-sharing under the CBD, not ozone.

Summary. Official key is (b) Montreal Protocol. It is the global instrument to control and phase out ozone-depleting substances. Bretton Woods is finance, Kyoto is climate GHGs, Nagoya is biodiversity ABS. Only Montreal matches ODS.