Which one among the following substances does not contribute to global warming ?

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Q: 73 (UPPSC/2013)

Which one among the following substances does not contribute to global warming ?

question_subject: 

Science

question_exam: 

UPPSC

stats: 

0,144,88,144,20,13,55

keywords: 

{'carbon dioxide': [2, 0, 5, 6], 'global warming': [3, 0, 1, 0], 'oxides': [0, 0, 3, 11], 'substances': [0, 0, 1, 1], 'methane': [0, 0, 0, 5], 'nitrogen': [1, 1, 0, 2], 'water vapour': [0, 0, 1, 2], 'sulphur': [0, 0, 0, 2]}