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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