I need to read the article(s), but there is one valid, limited application of ethanol in the industry/product. It is superior to MTBE from an environmental per

I need to read the article(s), but there is one valid, limited application of ethanol in the industry/product. It is superior to MTBE from an environmental perspective. That means, as an additive. Not as a primary fuel source. And for this purpose, no subsidy is needed, as far as I know (and now that the risk associated with MTBE is prohibitive including from a business perspective). P.S. Oh, and Brazil is making pretty good use of ethanol, although I'm not too familiar with the environmental downside in their production -- I suspect there is some.