While the hump-shaped relationship between income levels and pollution levels seems to hold across a wide range of pollutants, ________ represent an important exception.
A) sulfur dioxide emissions
B) lead concentrations
C) carbon dioxide emissions
D) water quality standards

Question

Quizplus · Accepted Answer

While the hump-shaped relationship depicted in Figure 1.5 in the text seems to hold across a wide range of pollutants-from sulfur dioxide to lead concentrations and water quality-carbon dioxide emissions are an important exception, rising steadily with higher income levels.

While the Hump-Shaped Relationship Between Income Levels and Pollution Levels