Alan Shaw, CEO of Calysta Energy, said he has given up on biomass-based biofuels and will instead focus on turning natural gas into fuels. Others in the advanced-biofuel industry, however, say it's too soon to throw in the towel on biomass. "I vehemently disagree with the observation that you can't make money converting biomass or sugar into fuel at large volume," said Solazyme CEO Jonathan Wolfson.

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