The main culprit of greenhouse effect is Carbon dioxide. But which is the second element contributing most to greenhouse effect.A. Nitrogen Dioxide (NO2)B. Chlorofluorocarbons (CFCs)C. Methane (CH4)D. High-fructose corn syrup (HFCs) 0 0 votesArticle Rating Subscribe LoginNotify of new follow-up commentsnew replies to my comments Label {} [+] Name* Email* Website Label {} [+] Name* Email* Website 0 Comments Oldest Newest Most Voted Inline FeedbacksView all comments