First came corn and cane as biomass for renewable fuel, then cellulosic materials and algae. Now Joule Biotechnologies Inc. has emerged from stealth mode with a recipe for making transportation fuel without biomass by simply harnessing solar power and carbon-dioxide emissions.

Joule Biotechnologies

The Cambridge, Mass.-based start-up, which is backed by its founders and venture-capital firm Flagship Ventures, has developed a technology using microorganisms that make fuels and chemicals from the photosynthetic conversion of sunlight and CO2. Joule’s scientists incorporated solar converters into the technology to optimize the process that makes what the company calls “solar fuel.”

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