This blog illustrates the ideas of ethanol as a fossil fuel

 Production of ethanol

Industrial production of ethanol from sugar cane

Ethanol is produced by glucose by utilizing the process called Fermentation. Fermentation process is the oldest known chemical process used by humans such as, Middle Eastern, Europeans and Asians. For Fermentation to occur you need: a suitable carbohydrate sources, a temperature kept constant around 25 degrees Celsius and a anaerobic conditions. this overall chemical reaction illustrates the components of glucose and ethanol.

In this equation the chemistry behind it is very complicated and difficult, which includes many steps for fermentation process to occur, each catalysed by a different enzyme produced by the living yeast cells. the presence of yeast is important because it produces an enzyme that catalyses the process of Glycolysis which produces glucose into ethanol and carbon dioxide. For pure Ethanol it needs to be distilled which will give you about 90% .
  

Explains the need for an alternative source of fuel

We need new alternative sources of fuel because it has been estimated that petrol will no longer exist. Petroleum is a non renewable resource, Scientist have estimated that petroleum will run out in the 3 decades. Some of these resources and materials cannot be recycled and re-used that is why it is non-renewable. Later on in the years as petroleum runs out every year the price of it will exceed and will increase. Most of these polymers are Non-Biodegradable which means, that microorganisms decompose materials. This can lead to waste disposal and pollution. Alternative sources such as, bio-polymers which can lead to better economical environments and less waste disposals.