Scientific studies strike a blow at ethanol - »Two scientific studies have just called into question the interest of the development of ethanol as an alternative biofuel to gasoline.
1 - First, an American scientific study published in Bioscience concludes that ethanol for fuel reduces biodiversity, increases soil erosion, and consumes large quantities of water - (…)
2 - An Anglo-American study, published in Nature resources research, which estimates that “there is no energy benefit in using the biomass of plants to make fuel.” According to researchers from the University of Cornell and Berkeley, the process of making ethanol from corn would require 29% more energy than that which ethanol can produce as fuel, and that of wood 57% more. The results of biodiesel appear to be of the same order with an energy requirement to produce it 27% more important than the energy released as fuel for soya, and 118% for sunflower (…) ”- Environmental Journal
For these analyzes to be complete, it would be useful to carry out similar studies concerning petroleum and fossil fuels. That is to say, see their overall impact on their entire chain of "production" and not only at the level of end use. What seems to be the case now….
These studies should take into account, for example but not only, the following points:
3) Transportation of crude
4) Refining the crude
5) Transportation of finished products
In addition, to be even more global, one should take into account the "cost" (econologically speaking) of wars ("preventive" or not) for oil (and fossil fuels in general, including uranium). These costs would logically be reflected in the part 1) Prospecting.