Approval of hydrotreated renewable jet fuels derived from vegetable oils is a big step toward sustainable low-carbon biofuels for aircraft. But a hurdle must be crossed: scaling-up feedstock production to meet even a fraction of the demand for jet fuel. Vast acreages need to be planted, farmers have to gain experience growing new crops, and yields must improve to bring down prices. All that takes time, and money. Meanwhile, questions remain about the life-cycle reductions in greenhouse ...


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