Many algae already use a carbon concentrating mechanism [0] similar to C4. It works in a similar way, by concentrating CO2 around RuBisCO, the key enzyme that c

Many algae already use a carbon concentrating mechanism [0] similar to C4. It works in a similar way, by concentrating CO2 around RuBisCO, the key enzyme that creates sugar from CO2. In C4 plants, the RuBisCO is kept in a wax-enclosed cell, and the CO2 is pumped in. In algae, which are single-celled, the RuBisCO aggregates together into a bubble-like structure called a pyrenoid [1], and a high CO2 concentration is maintained inside. 0: http://en.wikipedia.org/wiki/Photosynthesis#Carbon_concentrating_mechanisms http://en.wikipedia.org/wiki/Photosynthesis#Carbon_concentra... 1: http://en.wikipedia.org/wiki/Pyrenoid http://en.wikipedia.org/wiki/Pyrenoid