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Montreal protocol aims at
A
Control of $CO_2$ emission
B
Reduction of ozone depleting substances
C
Biodiversity conservation
D
Control of water pollution
Detailed Solution
The Montreal Protocol is an international treaty signed at Montreal, Canada, in 1987 (effective from 1989).
Its aim is to control the emission of ozone-depleting substances such as CFCs, in order to protect the ozone layer of the stratosphere.
Control of $CO_2$ and other greenhouse gases is the aim of the Kyoto Protocol.
Biodiversity conservation was the subject of the Earth Summit at Rio de Janeiro (1992).
Hence the Montreal Protocol aims at the reduction of ozone depleting substances.
Its aim is to control the emission of ozone-depleting substances such as CFCs, in order to protect the ozone layer of the stratosphere.
Control of $CO_2$ and other greenhouse gases is the aim of the Kyoto Protocol.
Biodiversity conservation was the subject of the Earth Summit at Rio de Janeiro (1992).
Hence the Montreal Protocol aims at the reduction of ozone depleting substances.