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Brazilian ethanol is a good example as it's cheaper than gas but we know that farmers have been clearing rain forrest for years to grow sugar cane.

Something most people in goverment and business seem to be missing is that like the hippies collecting used fryer oil to fuel their diesels, bio fuels real value is when it's made from post consumer waste. I have recently seen in the news that more than 40% of food in North America is put to landfill so I wonder how much extra farm land is really needed?