Which of the following is a common greenhouse gas classified as an F-Gas?

HFC-134a, or 1,1,1,2-tetrafluoroethane, is classified as an F-Gas because it belongs to the family of fluorinated gases. These gases are known for their high global warming potential and are commonly used in refrigeration, air conditioning, and foam-blowing applications. The classification of F-Gases includes hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6), all of which possess significant greenhouse gas effects when released into the atmosphere.

In contrast, carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) are not classified as F-Gases. They fall under the category of naturally occurring greenhouse gases that are primarily associated with biological processes and human activities such as fossil fuel combustion or agriculture. While these gases do contribute to climate change, they are not part of the fluorinated gases specifically referenced in F-Gas regulations and guidelines. Therefore, HFC-134a is the correct answer when identifying a common greenhouse gas categorized as an F-Gas.