This might be of interest: http://ethanolproducer.com/articles/8563/billion-gallons-u-s-ethanol-exported-brazil-top-destination
Good find. I was aware that Brazilian ethanol supplies have been tight. Any sugar source is a crop like any other, suffering from vagaries of weather and markets.
Agriculture subsidies of all kinds are understandable given justifiable fears of actual food shortages. Maybe not right, but understandable.