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July07-offprint-Burkhardt.pdf

In a coarse grain global analysis the average total power used by humans is given, and compared with total solar insolation on land. The theoretically possible and the actual overall efficiency of the conversion of solar energy by technical and biological means is determined. The resulting limitations of biomass energy for replacing fossil fuels are considered. Other problems of energy farming are analyzed. Conclusions are drawn, and future energy policies are recommended.