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Photosynthesis or photovoltaics: Weighing the impact
Date:5/12/2011

ibly across boundaries that were established over geological time scales, says Moore. Earth systems affected include the nitrogen cycle, carbon cycle, fresh water, land use, and an increase in the rate of biodiversity loss. In other words, photosynthetic energy flow is currently booked (almost certainly overbooked) for biosphere services including food and limited bioenergy production for human use. As a consequence, there are no reserves of photosynthetic capacity to provide increasing amounts of biofuel for growing our GDP and food for the ever-increasing human population. Indeed, when such demands are made, the capacity comes at the further peril of biosphere services.

"Fortunately, the efficiency of photosynthetic NPP could be dramatically improved to meet human needs - the 133 terawatts increased to about 150 terawatts with minimum additional impact on Earth systems," explains Moore excitedly. "I'm thinking about selected photosynthetic systems in which rational design, based on the principles demonstrated in artificial systems, could be used to optimize solar-to-biofuel conversion efficiencies to meet particular needs."

"Such photosynthetic systems would be 'living' in that they would retain key features of living cells including self-assembly, repair, replication and the use of Earth-abundant materials features that I think are essential to scale and match sustainable energy production to local needs but that remain elusive to non-living, human engineered constructs," concludes Moore.


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Contact: Jenny Green
jenny.green@asu.edu
480-965-1430
Arizona State University
Source:Eurekalert  

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