Abstract
Most of the energy we consume comes from fossil fuels such as oil, gas, coal and uranium. Yet, these sources of energy present several problems. They are non renewable and their demand keeps growing on a daily basis. Besides, the fields, mainly located in specific geographic areas can generate some conflicts such as for prices and secure carriage. Moreover they have produced several environment crises and catastrophes, such as a massive greenhouse gas effect, oil slicks and so on, leading officials and specialists to further develop biofuels. Biofuels are derived from biological sources and qualities similar to oil. As a renewable source of energy, the use of biofuels has become increasingly important in the last few years in particular for transport, a sector where they can displace a substantial amount of oil around the world. How and when did they appear? In what cases can we use biofuels at a satisfactory and efficient level? While biofuels were initially a single option for exclusive specialists and few environmentalists, within a few years they reached the position of potential alternative to fossil fuels arousing a growing interest worldwide.
