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David Pimentel, Professor of the Department of Ecology and Agriculture, Cornell University, and Tad W., Professor of Civil and Environmental Engineering, University of California, Berkeley. The study, completed by Patzek, validated the energy input and output ratios for the production of ethanol from corn and wood biomass and biodiesel from soybeans and sunflower.
Dr. Pimentel said: “The use of plants to produce liquid fuels does not save energy. This biofuel development strategy is not sustainable.†The study found that fossil fuels needed to produce ethanol from corn can produce fossil fuels that are much lower than corn can produce. 29% more energy is produced, and 57% more wood biomass. For energy input and output ratios in the production of biodiesel from soybeans and sunflowers, it was found that the fossil energy needed to produce biodiesel from soybeans is 27% more than the energy produced by soybeans to produce biodiesel. 118% more.
In determining the energy input during the production of ethanol and biofuels for these crops, the researchers considered the energy input required for the production of these crops, as well as the energy input required by the crops to produce ethanol and biodiesel fuel.
Although Dr. Pimentel advocates the generation of heat by burning these biomass, he is skeptical of the use of these biomass to produce liquid fuels. He pointed out: "Using crops to produce ethanol and biodiesel is not a renewable energy source, nor is it an economic fuel. Further, the production and use of this fuel will lead to air, water and soil pollution. And global warming."
However, ethanol producers are skeptical about Dr. Pimentel and Dr. Patzek's point of view. They point out that these data are out of date and do not take into account profits. The profits from the production of biofuels from crops make up for the cost.
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Crop biofuels cause controversial aesthetics research found that: the conversion process consumes much more energy than the energy generated
In the current situation where oil prices continue to rise and oil resources supply is tight, countries around the world have increased their investment in the development of biofuels. However, a new study in the United States shows that the energy needed to convert plants such as corn, soybeans, and sunflower into fuel is more than the energy that these plants can generate into ethanol or biodiesel. In the latest "HP" journal, American scholars published articles that the production of biofuels from crops is not energy-efficient.