First slide

Ozone Depletion in the Stratosphere

Question

Montreal protocol to control the emission of ozone depleting substances became effective in the year

Moderate

A

1989
B

1987
C

1997
D

1986

Solution

Montreal Protocol, to control the emission of ozone depleting substances (ODS), was signed at Montreal (Canada) in 1987 but became effective in the year 1989.

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