what are the disadvantages of using ethanol as a fuel?
["It isn't as effective a fuel as traditional gasoline. ... ", 'It is a corrosive fuel. ... ', 'It requires a lot of cropland space. ... ', 'It is costly. ... ', 'Its use has resulted in a net emissions increase. ... ', 'It has altered food production principles. ... ', 'It is reliant on the quality of the growing season.']