Audi is currently developing a method for producing synthetic gasoline and diesel by using CO2 that normally is pumped into the atmosphere. This would have to be a complex process that involves big transparent tubes filled with water that could measure up to 100 meters. Besides water, these tubes also contain genetically-modified cyanobacteria.
As a result of exposing these bacteria to CO2 and sunlight, Audi is capable of producing what they call e-ethanol (gasoline) and e-diesel. According to the German carmaker, a vehicle that runs on one of these two fuels will generate the same amount of CO2 as an EV.
If all things go according to the plan Audi will open a commercial plant for creating these two new types of fuel sometime in 2014.