Southwest Airlines announced Wednesday that it plans to buy some biofuels made from waste wood, for use in its San Francisco Bay airports beginning in two years.

To use Southwest's phrasing, it is purchasing “low carbon renewable jet fuel, made using forest residues that will help reduce the risk of destructive wildfires in the Western United States.”

It has agreed to buy about 3 million gallons a year from Red Rocks Biofuels, a Fort Collins, Colorado, that focused on recycling that foresty stuff.

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