Which of the following greenhouse gases has no natural source?
A)carbon dioxide
B)chlorofluorocarbons
C)nitrous oxide
D)methane

Name: Which of the following greenhouse gases has no natural source? A)carbon dioxide B)chlorofluorocarbons C)nitrous oxide D)methane
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Question

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Chlorofluorocarbons (CFCs) are entirely man-made and have no natural sources. They were widely used in air conditioning, refrigeration, and as propellants in aerosol sprays before their harmful effects on the ozone layer were discovered.

Which of the Following Greenhouse Gases Has No Natural Source