Which one of the following is the main culprit in the thinning of Ozone layer in the earths stratosphere ?

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(IES/)
Which one of the following is the main culprit in the thinning of Ozone layer in the earth’s stratosphere ?
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question_subject: 

Geography

question_exam: 

IES

stats: 

0,33,5,2,33,2,1

keywords: 

{'ozone layer': [6, 0, 0, 6], 'carbon dioxide': [2, 0, 5, 6], 'chlorofluro carbons': [1, 0, 0, 0], 'nitrogen oxides': [0, 0, 0, 1], 'thinning': [1, 0, 0, 0], 'methane': [0, 0, 0, 5], 'main culprit': [1, 0, 0, 0]}