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Which of the following is a “greenhouse gas” (natural or human-induced)? A) carbon dioxide B) methane C) ozone D) chlorofluorocarbons E) all of the above

 Which of the following is a “greenhouse gas” (natural or human-induced)?
A) carbon dioxide
B) methane
C) ozone
D) chlorofluorocarbons
E) all of the above

 
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