A) persistent organic pollutants
B) global warming and climate change
C) substances that deplete the ozone layer
D) biosafety of genetically modified organisms
Correct Answer: C
Solution :
Worlds major producers and consumers of pollutants met at Montreal (Canada) on September 16, 1987 to solve the problem of ozone thining in stratosphere. 24 countries signed the protocol that came into force on January 1, 1989. This protocol refers to the substances such as CFCs (chlorofluorocarbons), methane that deplete the ozone layer.
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