Is there any type of organism or bacterium that can convert CO2 to O2 more efficiently than plants, and if not what is the most efficient plant for converting CO2 to O2.
The following should be helpful:
efficiency from greatest to less efficient
CAM plants such as cacti > C4 plants such as grasses > C3 plants such as most other
plants and trees
Blue-green algae (cyanobacteria) also carry on photosynthesis:
Other photosynthetic bacteria:
Anthony Brach Ph.D.
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Update: June 2012