Using Photosynthesis for a source of energy

http://www.technologyreview.com/computing/26157/?mod=related

Quoted values sunlight-to-biomass efficiency
Plant                      Efficiency
Plants, typical        0.1%[2]
                          0.2–2%[3]
Typical crop plants        1–2%[2]
Sugarcane            7-8% peak[2][4]


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