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Scientific issues associated with carbon-neutral energy sources such as cellulosic ethanol

Professor Chris Somerville of the Carnegie Institution and Stanford University, explained advances in plant science research that are both needed and achievable to reduce costs and multiply current levels of production of biofuels from plant cellulose (biomass).

Somerville presented his talk, "Bioenergy: The 21st Century Challenge to Plant Biologists" at the Annual Meeting of the American Society of Plant Biologists (ASPB) today (4:30 p.m. Eastern Time August 5) in Boston's Hynes Convention Center. The presentation was part of the Major Symposium: "Plants Mitigating Global Change" organized by Professor Stephen Long of the University of Illinois at Urbana-Champaign.

Somerville noted the concept that CO2 emissions may negatively affect climate are not new.

"In 1895, Arrhenius presented a paper to the Stockholm Physical Society titled, On the Influence of Carbonic Acid in the Air upon the Temperature of the Ground in which he argued that increased concentration of atmospheric CO2, such as that caused by combustion of fossil fuel, would lead to the warming of the earth," Somerville commented. "It is apparent that he [Arrhenius] was correct and that we must develop alternative sources of energy."

The earth receives approximately 4,000 times more energy from the sun each year than the total projected human uses in the year 2050, Somerville commented. Green plants growing throughout the world capture the sun's (solar) energy and convert it to bio-chemical energy in a process called photosynthesis. There are vast energy supplies of renewable plant biomass growing throughout the nation and world. There is widespread interest in returning to the use of plants as widely used sources of renewable energy

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"However, because of competing uses for land, a central challenge for 21st century biologists is to increase the efficiency of solar energy capture to the theoretical limit by rational methods. In order to accomplis h this we need to acquire and integrate all aspects of knowledge about plant biology into a systems level understanding that can support an engineering approach to plant improvement," Somerville said.

Somerville explained specific areas of research that need to be addressed during his presentation August 5 in Boston. The Advanced Energy Initiative(AEI), a research initiative announced by President Bush in his 2006 State of the Union Address, embraces key recommendations of Somerville and the plant and microbiological science communities. Somerville called the AEI a visionary research initiative that will help transition the nation's transportation sector to use of domestically produced biofuels. Displacing use of gasoline with biofuels, such as cellulosic ethanol, will dramatically reduce emissions of stored carbon dioxide into the atmosphere, Somerville noted.

This past year, Somerville has been participating in workshops organized by the U.S. Department of Energy Office of Science to address the nation's renewable energy needs. The workshops provided information that contributed to the development of the Advanced Energy Initiative of President Bush. The Advanced Energy Initiative is a landmark research effort designed to help break the nation's addiction to oil. A member of the National Academy of Sciences, Somerville recently published the guest editorial in Science (June 2, 2006, Volume 312) concerning bioenergy research. He is a grantee of the DOE Office of Science's Basic Energy Sciences competitive grant awards program for Energy Biosciences research and member of the DOE Office of Science Biological and Environmental Research Advisory Committee (BERAC). He was the speaker on "Biofuels and the [DOE] Biofuels Workshop Report" at the July 11, 2006 meeting of BERAC.


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Source:American Society of Plant Biologists


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