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Half the cars in Brazil run on enthanol, and most of the petrol vehicles there can use flex fuel engines (they can run on eitheir petrol or ethanol) or any mixture of the two.
They use sugar cane to make the ethanol, which is apparently more efficient than any other crop to make high efficient ethanol. With cheap labor, huge amounts of land, the optimal climate for growing sugar cane year round and huge refineries to process sugar cane into ethanol - they are beginning to export it to countries like China.
Who knows, maybe in 20 years the USA will be invading countries like Brazil for their sugar cane rather than invading countries like Iraq for their oil.
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