What is the concentration of carbon dioxide in the atmosphere?

1.	What is the concentration of carbon dioxide in the atmosphere?
A.	3.5 x 10<sup>6</sup> ppm
B.	1.0 x 10<sup>2</sup> ppm
C.	1.6 x 10<sup>5</sup> ppm
D.	1.0 x 10<sup>3</sup> ppm
Answer» B. 1.0 x 10<sup>2</sup> ppm

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What is the concentration of carbon dioxide in the atmosphere?

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