Which gas is major contributor to greenhouse effect?

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Q: 246 (SSC/NA)
Which gas is major contributor to greenhouse effect?

question_subject: 

Science

question_exam: 

SSC

stats: 

0,11,13,11,12,1,0

keywords: 

{'greenhouse effect': [3, 0, 0, 1], 'carbon dioxide': [2, 0, 5, 6], 'nitrogen dioxide': [3, 0, 1, 8], 'chloroflurocarbon': [3, 0, 0, 0], 'sulphur dioxide': [0, 0, 0, 1], 'gas': [9, 1, 9, 27], 'major contributor': [1, 0, 0, 0]}