1.

Greenhouse gases that occur both naturally and from human activities include water vapor, carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and ozone (O3). ​

Answer»

Many greenhouse gases occur naturally in the atmosphere, such as carbon dioxide, methane, water vapor, and NITROUS OXIDE, while OTHERS are synthetic. Those that are man-made include the chlorofluorocarbons (CFCs), hydrofluorocarbons (HFCs) and Perfluorocarbons (PFCs), as WELL as sulfur hexafluoride (SF6).



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