This is also a type of alcohol that can be made by fermenting sugar (though the fermentation is done by a species of bacterium rather than by yeast), and it has some advantages over ethanol.

ECONOMIST: Advanced biofuels

Companies are using proprietary technology that takes inputs as diverse as algae, willow trees and sugar cane to produce oils and biomaterials in standard fermentation facilities quickly, cleanly, inexpensively and on a large scale.

FORBES: Cunning Capitalists Go Blazing Into Biofuels