Question 25 A Multilateral agreement in which countries signed to ban the trade of products that deplete the Ozone layer Doha Round 2001, Qatar Kyoto Protocol 1995, Japan Montreal Protocol 1991, Canada Uruguay round 1986, Uruguay Moving to another question will save this response. Solution Montreal Protocal 1991, Canada. The Montreal Protocol on Substances that Deplete the Ozone Layer is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. (c) is correct..