
Santa Barbara based Carbon Sciences claims to have a scalable, non-energy intensive process to transform CO2 and water into carbon fuel or into solid calcium carbonate.
Of the fuel process they state:
Some of the known approaches for CO2 to fuel transformation include (1) direct photolysis which uses intense light energy to break off the oxygen atoms in CO2, and (2) chemically reacting carbon dioxide gas (CO2) with hydrogen gas (H2) to create methane or methanol. Both of these conventional engineering approaches require immense energy due to high pressure and high temperature chemical processes. For certain applications such as military and space, the high cost of these technologies may be justifiable. However, we do not believe these approaches will be economically viable in creating transportation fuels for global consumption.
By innovating at the intersection of chemical engineering and bio-engineering, we have discovered a low energy and highly scalable process to transform large quantities of CO2 into gaseous and liquid fuels using organic biocatalysts. The key to our CO2-to-Fuel approach lies in a proprietary multi-step biocatalytic process. Instead of using expensive inorganic catalysts, such as zinc, gold or zeolite, with traditional high energy catalytic chemical processes, our process uses inexpensive, renewable biomolecules to catalyze certain chemical reactions required to transform CO2 into basic hydrocarbon building blocks. Of greatest significance, our process occurs at low temperature and low pressure, thereby requiring far less energy than other approaches.
If truly scalable it could be significant, providing a (near) closed loop "fossil fuel". In theory we could burn coal for example and turn it into a vehicle fuel. The problem of course is that capturing CO2 from millions of mobile sources is very difficult but it could be an important transitional phase as a 2 for 1 carbon reduction. Alternately, the fuel could be burned by an electrical plant and from its CO2 new fuel is created for the same plant. And if the transformation is powered by renewable fuel (and vehicles are electric) this is extremely attractive.
Furthermore, Carbon Sciences claims to have a process which takes CO2 and other minerals as input and
outputs calcium carbonate.

Like the first process, this is a devils in the details discussion but here too the potential benefits are considerable. With China building
2-31-2 coal plants a
monthweek, it is urgent to find a means to sequester carbon. Most discussions have circled around injecting it in the ground or ocean. Injecting it deep underground as a gas will likely result in leakage, which is catastrophic even in small quantities. Injecting it in the ocean, even frozen has consequences not just with leakage but on ocean acidity - and in turn all life in the ocean. These are not credible options any time soon. But as a solid, sequestration- and even reuse - becomes credible.
Interestingly, just days ago I spoke with a former senior scientist for Toyota who was instrumental in the creation of the Prius now working on a CO2 to solid carbon sequestration process with a new firm called Full Circle. He claims the CO2 can be sequestered this way for 10,000 years. It seems more than one firm has their eye on that opportunity.
More on Carbon Sciences at
TriplePundit.