Greenbox: Converting car emissions to biofuel

From Reuters:

Dubbed "Greenbox", the technology developed by organic chemist Derek Palmer and engineers Ian Houston and John Jones... [is]a box which they say can be fixed underneath a car in place of the exhaust to trap the greenhouse gases blamed for global warming -- including carbon dioxide and nitrous oxide -- and emit mostly water vapor.

The captured gases can be processed to create a biofuel using genetically modified algae.

Through a chemical reaction, the captured gases from the box would be fed to algae, which would then be crushed to produce a bio-oil. This extract can be converted to produce a biodiesel almost identical to normal diesel. This biodiesel can be fed back into a diesel engine, the emptied Greenbox can be affixed to the car and the cycle can begin again.

The process also yields methane gas and fertilizer, both of which can be captured separately. The algae required to capture all of Britain's auto emissions would take up around 1,000 acres.

If this is as advertised, it could be a great tool in slowing global warming.