A study by the Environmental Protection Agency looked at the costs and benefits of the Clean Air Act from 1970 to 1990. This study found that a middle-range estimate of health and other benefits of cleaner air were valued at $22 trillion. This amount was about than the costs of reducing pollution, which was around $500 billion, in the same period.

answer; ///i believe that the correct answer is (post conventional)

1) the stages a new product goes through from beginning to end, i.e., the stages that a product passes through from introduction through growth, maturity, and decline. 2) the time from initial research and development to the time at which sales and support of the product to customers are withdrawn. 3) the period of time during which a product can be produced and marketed profitably.

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