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Perspective: US Needs to Transition to Hydrous Ethanol as the Primary Renewable Transportation Fuel

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Use of Hydrous Ethanol in Brazil. Brazil, the largest and most populous country in South America, was importing 80% of its oil and 40% of its foreign exchange was used to pay for that imported oil. In 1975, General Ernesto Geisel, then-president of Brazil, ordered the country’s gasoline supply mixed with 10% ethanol.

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UNEP Report Calls for More Sophisticated Approach to Developing Biofuels; Limitations of Current LCA Studies

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Here, RME show advantages for primary energy and GHG, but disadvantages in terms of acidification, eutrophication and ozone depletion. As currently practiced in a country such as Brazil, it can lead to emissions reductions of between 70% and well over 100% when substituted for gasoline. Source: “Assessing Biofuels”. Click to enlarge.

Ozone 186
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SCOPE Biofuels Project Releases Assessment on Environmental Effects of Biofuel Technologies

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On the production side, options exist for improving technologies in terms of new feedstocks and conversion technologies as well as more efficient use of biomass. A few studies also include other relevant impact indicators as acidification potential, eutrophication potential, ozone depletion potential and various toxicity potentials.