6. The mass of carbon dioxide in gigatonnes emitted into the atmosphere globally in the year 2000 was approximately (A)2 (B)8 (C)15 (D)30

5. The enhanced greenhouse effect is due to (A)increased trapping of infrared radiation emitted from the Earth's surface and oceans. (B)decreased trapping of infrared radiation emitted from the Earth's surface and oceans. (C)increased trapping of visible and ultraviolet radiation emitted from the Earth's surface and oceans. (D)decreased trapping of visible and ultraviolet radiation emitted from the Earth's surface and oceans.

6. The mass of carbon dioxide in gigatonnes emitted into the atmosphere globally in the year 2000 was approximately
(A)2
(B)8
(C)15
(D)30

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