First slide
Ozone Depletion in the Stratosphere
Question

Which of the following is mainly concerned with control of emission of ozone depleting substances?

Easy
Solution

Recognising the deleterious affects of ozone depletion, an international treaty, known as the Montreal Protocol, was signed at Montreal (Canada) in 1987 (effective in 1989) to control the emission of ozone depleting substances. 

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