Getting around while burning less CO2.

Help the planet.
Oct. 23 2006 11:56 AM

Travel Light

How to get around while burning less CO2.

What's the "Green Challenge"? Click here. If you've completed the weekly action quizzes, click here for the wrap-up quiz.

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Meaghan O'Neill is a freelance writer and founding editor of treehugger.com, an eco-Web site and Slate's partner on the Green Challenge.

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