13. Obstacles to recycling include (A)lack of inclusion of environmental costs in market prices (B)tax breaks for mining virgin materials (C)lack of large, steady markets for recycled materials (D)all of these answers

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.

13. Obstacles to recycling include
(A)lack of inclusion of environmental costs in market prices
(B)tax breaks for mining virgin materials
(C)lack of large, steady markets for recycled materials
(D)all of these answers

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