As a result of measures to control acid-deposition in North America,over the last 20 years emissions of sulfur dioxide have been
A)steady,with little decrease in acid-deposition due to rising levels of nitrogen oxides.
B)reduced by about 10%,at great cost to the power producing industry.
C)reduced to target levels at about the projected cost of compliance.
D)reduced beyond target levels and at 10% of the projected compliance costs.

Question

Quizplus · Accepted Answer

Over the last 20 years, measures to control acid-deposition in North America have been successful in reducing emissions of sulfur dioxide beyond the target levels. The compliance costs were also significantly lower, at only 10% of the projected costs. This has been achieved through the implementation of policies and regulations such as the Acid Rain Program, which requires power plants to reduce their emissions. Reduction in acid deposition due to the control of nitrogen oxides has also contributed to the success in reducing sulfur dioxide emissions.

As a Result of Measures to Control Acid-Deposition in North