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apr28envsnotes - Biomass Energy from the sun via...

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Biomass Energy from the sun, via photosynthesis in plants This is the same energy we use as food This is the same energy that made fossil fuels The oldest form of energy used by humans: wood fire. Efficiency Plants use only a tiny amount of the sun’s energy for photosynthesis, less than 1%. The efficiency of photosynthesis is low, about 5% maximum (solar energy to energy in sugar). Potential Potential seems impressive… United States: If we harvest all crops for energy, the amount of energy available (at 100% conversion efficiency) is about equal to the total annual energy used in the United States. The world: The amount of energy in the global biomass is about 8 times more than the amount of energy currently used globally. Potential Good: Biomass can be “carbon neutral”… (but it rarely is in reality) Bad: We grow just enough food to feed people… any biomass energy use means food issues Deforestation results as a price…blah Burning Biomass
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This note was uploaded on 05/02/2008 for the course ENVS 1000 taught by Professor Neff,jason during the Spring '07 term at Colorado.

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apr28envsnotes - Biomass Energy from the sun via...

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