First slide

Ozone Depletion in the Stratosphere

Question

Montreal protocol was signed in

Moderate

A

1987 and became effective in 1989 to control the emission of ozone depletion substances.
B

1989 reduce emission of green house of gases.
C

1997 to mitigate global climate changes.
D

1992 to conserve biodiversity.

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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