Botany: Arboreal Pollution

In New Brunswick, N.J., where Joyce Kilmer is said to have written his verses praising trees, a leading botanist last week blamed them for their role in one of civilization's greatest concerns: air pollution. At a biometeorological conference at Rutgers, University of Nevada Professor Frits Went stated flatly that trees foul the air with ten times more pollutants than all of man's fires, factories and vehicles.

Such trees as fragrant pine and plants such as pungent sage produce the "blue haze" that occurs during summer, even over relatively uninhabited areas of land. They emit molecular substances known as terpenes...

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