Suppose the concentration of Carbondioxide, a green-house gas responsi – McqOptions

MCQOPTIONS

1.	Suppose the concentration of Carbondioxide, a green-house gas responsible for climate change, is 400 ppm. What is its concentration in air in percentage terms?
A.	0.04%
B.	0.4%
C.	0.004%
D.	4.0%
Answer» B. 0.4%

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