Is it always greener to take public transportation?

Illuminating answers to environmental questions.
Nov. 25 2008 7:02 AM

Trains vs. Planes vs. Automobiles

Is it always greener to take public transportation?

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* Correction, Nov. 25, 2008: This article originally misstated the relationship between the emissions produced by Caltrain and those produced by a sedan. The train generates less than half as many greenhouse-gas emissions or particulate matter per passenger mile as a sedan, not less than twice as much. (Return to the corrected sentence.)

Jacob Leibenluft is a writer from Washington, D.C.