Question

Montreal protocol was signed in

• A. 1987 and became effective in 1989 to control the emission of ozone depletion substances.
• B. 1989 to reduce emission of green house of gases.
• C. 1997 to mitigate global climate changes.
• D. 1992 to conserve biodiversity.

Answer 1

Answer: (A)

In 1987 in Montreal, Canada. Twenty-seven industrialized countries signed an international treaty called Montreal protocol.
​Its main objective was to protect the stratospheric ozone by limiting the production and use of ozone-depleting substances, developing alternatives to chlorofluorocarbons, phasing out of ozone depleting substances.