World Trade Organization protesters and other globalization foes may have one less fear to fret about. Although manufacturers in the United States are churning out more and more products, their smokestacks are belching out less and less air pollution — and not just because companies are making poor countries do their dirty work. Instead, green technologies are largely clearing the air, finds Arik Levinson, a professor of economics at Georgetown University.

“A lot of [activist] groups think of...


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