Ethanol Factory: Coskata vice president Richard Tobey (above) stands before bales of hay, a feedstock that his company’s new technology can efficiently convert into ethanol. He’s holding the centerpiece of that technology, a bioreactor. Credit: Thomas Chadwick

As he leads a tour of the labs at Coskata, a startup based in Warrenville, IL, Richard Tobey, the company's vice president of research and development, pauses in front of a pair of clear plastic tubes packed with bundles of white fibers. The tubes are the core of a bioreactor, which is itself the heart of a new tech­nology that Coskata claims can make etha­nol out of wood chips, household garbage, grass, and old tires--indeed, just about any organic material. The bioreactor, Tobey explains, allows the company to combine thermochemical and biological approaches to synthesizing ethanol. Taking advantage of both, he says, makes Coskata's process cheaper and more versatile than either the technologies widely used today to make ethanol from corn or the experimental processes designed to work with sources other than corn.

Select from the choices above to read the entire article.