Carbon dioxide created by the widespread burning of fossil fuels is the key factor in climate change, so researchers are looking for new ways to generate cleaner power.
Researchers from the University of Georgia have shown they can take the carbon dioxide trapped in the atmosphere and turn it into industrial products - a roadmap to biofuels made directly from the carbon dioxide in the air.
During the process of photosynthesis, plants use sunlight to transform water and carbon dioxide into sugars that the plants use for energy, much like humans burn calories from food. These sugars can be fermented into fuels like ethanol, but it has proven extraordinarily difficult to efficiently extract the sugars, which are locked away inside the plant's complex cell walls.
The process is made possible by a microorganism called Pyrococcus furiosus, or "rushing fireball," which thrives by feeding on carbohydrates in the super-heated ocean waters near geothermal vents. By manipulating the organism's genetic material, Adams and his colleagues created a kind of P. furiosus that is capable of feeding at much lower temperatures on carbon dioxide.
The research team then used hydrogen gas to create a chemical reaction in the microorganism that incorporates carbon dioxide into 3-hydroxypropionic acid, a common industrial chemical used to make acrylics and many other products.
"Basically, what we have done is create a microorganism that does with carbon dioxide exactly what plants do—absorb it and generate something useful," said Michael Adams, Georgia Power professor of biotechnology and Distinguished Research Professor of biochemistry at the University of Georgia. "What this discovery means is that we can remove plants as the middleman. We can take carbon dioxide directly from the atmosphere and turn it into useful products like fuels and chemicals without having to go through the inefficient process of growing plants and extracting sugars from biomass."
With other genetic manipulations of this new strain of P. furiosus, Adams and colleagues could create a version that generates a host of other useful industrial products, including fuel, from carbon dioxide.
When the fuel created through the P. furiosus process is burned, it releases the same amount of carbon dioxide used to create it, effectively making it carbon neutral, and a much cleaner alternative to gasoline, coal and oil.
"This is an important first step that has great promise as an efficient and cost-effective method of producing fuels," Adams said. "In the future we will refine the process and begin testing it on larger scales."
Published in the Proceedings of the National Academies of Sciences.