been posted somewhere :
Some algae species has the capability to photosynthesis in a higher-rate than any other plants in the world. It means that when these algae photosynthesizing, they can turn much more CO2 into Hydrocarbon chain that store solar energy, which would be harvested later as Biofuel.
The idea is to create a small, rugged compartment to grow algae that is compact enough to be attached into a motorcycle. This component is called the Photo-Bioreactor. It looks like a clear tube contained water , algae and some nutrient.
Supplied with CO2 and sunlight, these algae will grow and produced oxygen within the Photo-Bioreactor. The CO2 needed for the process will be supplied by the motorcycle's engine exhaust. When the Photo-Bioreactor has enough Algae concentration, the motorcycle owner could bring it to a biofuel producer to get "fresh" Photo-Bioreactor as an exchange. "Fresh" Photo-Bioreactor means, a Photo-Bioreactor with low algae concentration and more nutrient.
With this technology, motorcycles would become carbon-neutral vehicle because the CO2 produced by the engine's combustion are turned into O2 by the Algae's photosynthesis, and the biofuel producer got raw material to process. So we will get double benefits: clean air and carbon neutral fuel.
Things still unclear is the effect of compartment to engine performance.