Costs of pollution control tend to A) decrease over time ...

[jon_i]

Costs of pollution control tend to
 
  A) decrease over time because of initial investments in reductions and new technologies.
  B) decrease over time because regulations generally become less restrictive.
  C) increase over time as levels of acceptable pollution become increasingly restrictive.
  D) increase over time as new technologies require renewed investments.

Question 2

The benefit to cost ratio of replacing chlorofluorocarbons in new cars was
 
  A) higher than predicted.
  B) lower than predicted.
  C) about what was predicted.
  D) unpredictable because of fluctuating costs of the replacement gases.

[joewallace]

Answer to Question 1

A

Answer to Question 2

A