Primary energy sources can be divided into non-renewables and
renewables. The reality shows that the energy availability from the
non-renewable sources is limited, and beyond that, the exploration,
the processing and the use of energy impose considerable impacts
on the environment [1–3]. Fossil fuels were formed a great
many years ago and are not renewable. Infact today, over 80% of
the energy we use comes from three fossil fuels: petroleum, coal,
and natural gas. About 98% of carbon emissions result from fossil
fuel combustion. Reducing the use of fossil fuels would considerably
reduce the amount of carbon dioxide and other pollutants
produced [4]. This can be achieved by either using less energy altogether
or by replacing fossil fuel by renewable fuels. Hence, the future
trend is towards using alternate energy sources. Fortunately,
technological developments are making the transition possible
[5]. Since fossil fuel has become a finite energy source, in the last
decades many efforts have been put into the production of renewable
alternative energy sources. Among the existing renewable
alternatives to fossil fuels, algae have raised great interest.