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10 great green moments in planes, trains and automobiles

By: Shea Gunther on Oct. 16, 2009, 11:21 p.m.
view of a jet engine in the sky

Photo: iStockphoto

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Jet biofuel

It takes a lot of energy to lift a 900,000-pound 747 laden with its full complement of 16 crew members and 400-plus passengers. Multiply that by the thousands of flights that lift off every year and you get a mountain-sized tank of fuel. But the biofuel uses a plant (or algae) source, which adds no net CO2.