Q543
What is the man-made greenhouse gas known as?
A.
Carbon dioxide
B.
HFC
AnswerC.
Ozone
D.
Water Vapour
Answer: Option B
Solution
Answer: Option B
Solution:
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).