Green diesel made from waste oils and fats may have a future in the airline industry as Boeing seeks approval for this purpose. The fuel is created by using hydrogen to break big molecules into smaller ones. Its cost of about $3 a gallon is comparable with conventional jet fuel but less than other biofuels, according to Boeing, and emits significantly less carbon dioxide. "Green diesel approval would be a major breakthrough in the availability of competitively priced, sustainable aviation fuel," said James Kinder, technical fellow in Boeing's Commercial Airplanes Propulsion Systems Division.

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