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Gevo seeks to scale up its process of using plants to make isobutanol, a renewable hydrocarbon that can be used to make chemicals and liquid fuels, including jet fuel.
Mazda's MX-5 Spyder concept features a tent-style soft top that's similar to a biofuel engine.
While the ethanol industry faces more skepticism, biofuel companies making drop-in replacements for petrofuels are moving out of demonstration stage to larger-scale production.
Virgin Group CEO Richard Branson says businesses need to take the lead on global warming and replacing fossil fuels to avoid to "the mother of all recessions."
Making industrial chemicals from plants is easier to crack into than the cut-rate world of transportation fuels for young green-tech companies seeking a commercial foothold.
The Virgin Group billionaire talked to CNET in-flight about why he doesn't see Elon Musk's SpaceX as a competitor and what he thinks BP should do next.