Partager l'article ! Ehanol & biodiesel versus fossil energy: Study Slams Economics Of Ethanol And Biodiesel A new joint study from Cornell University a ...
Study Slams Economics Of Ethanol And Biodiesel
A new joint study from
"There is just no energy benefit to using plant biomass for liquid fuel," said study author and Cornell researcher David Pimentel. "These strategies are not sustainable."
The study, appearing in Natural Resources Research, entailed a detailed analysis of the energy input-yield ratios of producing ethanol from corn, switch grass and wood biomass as well as for producing biodiesel from soybean and sunflower plants.
The researchers considered such factors as the energy used in producing the crop (production of pesticides and fertilizer, running farm machinery and irrigating, grinding and transporting the crop) and in fermenting/distilling the ethanol from the water mix.
For ethanol production, the study found that:
· Corn requires 29 percent more fossil
energy than the fuel produced.
· Switch grass requires 45 percent more fossil energy than the fuel produced.
· Wood biomass requires 57 percent more fossil energy than the fuel produced.
For biodiesel production, the study found that:
· Soybean plants requires 27 percent more fossil energy than the fuel produced.
· Sunflower plants requires 118 percent more fossil energy than the fuel produced.
The researchers acknowledged that finding alternative fuel sources was of great importance but said that bio-fuels were not the answer.
"The
While bio-fuels may not be the answer to the looming specter of decreasing oil production, Pimentel does advocate the use of burning biomass to produce thermal energy (to heat homes, for example).
In closing, Pimentel said the
Ref: Natural Resources Research (Vol. 14:1, 65-76)
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http://www.transportation.anl.gov/pdfs/AF/265.pdf
Ten or more studies from different authors are reviewed in this 2002 USDA-sponsored study. Results from Pimentel's earlier work (showing a net negative energy balance) are included. The majority of studies show a net-positive balance.
A wealth of data on alternative fuels can be found at:
http://www.transportation.anl.gov/index.html
Lastly, would you trust the analysis of a group devoted to alternative fuel energy analysis or an entomologist, like Pimentel?
Brian Penttila
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