Over the past decade, concern over potential global warming has focused attention on the emission of greenhouse gases into the atmosphere, and there is an active debate concerning the desirability of reducing emissions. At the heart of this debate is the future path of both greenhouse gas...

Over the past decade, concern over potential global warming has focused attention on the emission of greenhouse gases into the atmosphere, and there is an active debate concerning the desirability of reducing emissions. At the heart of this debate is the future path of both greenhouse gas...

Findings of inverted-U relationships between income and certain types of pollution have generated considerable controversy, yet relatively little is known about the factors underlying these relationships. U.S. emissions of several major air pollutants have begun to decline, mirroring the...