In an online first article by Richard Plevin in de Journal of industrial Ecology the authors explain the differences between a recent study by Liska et al. and the GREET model that is used by regulators in California. It turned out that Liska assumed a more efficient biorefinery and in some cases fails to properly account for upstream emissions. When this is corrected both models come up with 61 g CO2-equivalent per MJ.
The work of Plevin is very important, especially when the discussion on a topic is as hot as it is with bioethanol. It is of utmost importance to clearly understand the reasons for the discrepencies in the results of different studies.
Update: Liska responds to Plevin and the editors enter the discussion.
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