Question

Which best describes the cost-benefit results of the first 20 years of the Clean Air?
A) Costs have been far greater than the benefits.
B) In 2010, alone, estimated benefits exceeded costs by 4 to 1.
C) Because many of the benefits of clean air are intangible, it is not possible to make such comparisons.
D) While costs have exceed benefits 2 to 1, benefits are expected to increase in the coming decades.

Answer

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