What was the main aim of Montreal Protocol?

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Q: 227 (SSC/NA)
What was the main aim of Montreal Protocol?

question_subject: 

Science

question_exam: 

SSC

stats: 

0,30,7,30,3,2,2

keywords: 

{'ozone layer': [6, 0, 0, 6], 'climate change': [1, 0, 2, 2], 'global warming': [3, 0, 1, 0], 'diversity conservation': [3, 0, 0, 0], 'main aim': [3, 0, 0, 0]}