16. Methods to prevent pollution from motor vehicle emissions include all of the following except (A)improving fuel efficiency (B)using pollution-control device (C)using mass transit (D)using less polluting fuels

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.

16. Methods to prevent pollution from motor vehicle emissions include all of the following except
(A)improving fuel efficiency
(B)using pollution-control device
(C)using mass transit
(D)using less polluting fuels

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